/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch licenses this file to you under
 * the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.elasticsearch.test.get;

import org.elasticsearch.Version;
import org.elasticsearch.action.DocWriteResponse;
import org.elasticsearch.action.admin.indices.alias.Alias;
import org.elasticsearch.action.admin.indices.flush.FlushResponse;
import org.elasticsearch.action.delete.DeleteResponse;
import org.elasticsearch.action.get.GetRequestBuilder;
import org.elasticsearch.action.get.GetResponse;
import org.elasticsearch.action.get.MultiGetRequest;
import org.elasticsearch.action.get.MultiGetRequestBuilder;
import org.elasticsearch.action.get.MultiGetResponse;
import org.elasticsearch.action.support.DefaultShardOperationFailedException;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.bytes.BytesReference;
import org.elasticsearch.common.lucene.uid.Versions;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.xcontent.XContentFactory;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.index.engine.VersionConflictEngineException;
import org.elasticsearch.plugins.Plugin;
import org.elasticsearch.testframework.ESIntegTestCase;
import org.elasticsearch.testframework.InternalSettingsPlugin;

import java.io.IOException;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;

import static java.util.Collections.singleton;
import static org.elasticsearch.common.xcontent.XContentFactory.jsonBuilder;
import static org.elasticsearch.testframework.hamcrest.ElasticsearchAssertions.assertAcked;
import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.hasKey;
import static org.hamcrest.Matchers.instanceOf;
import static org.hamcrest.Matchers.not;
import static org.hamcrest.Matchers.notNullValue;
import static org.hamcrest.Matchers.nullValue;
import static org.hamcrest.Matchers.startsWith;

public class GetActionIT extends ESIntegTestCase {

    @Override
    protected Collection<Class<? extends Plugin>> nodePlugins() {
        return Collections.singleton(InternalSettingsPlugin.class);
    }

    public void testSimpleGet() {
        assertAcked(prepareCreate("test")
                .addMapping("type1", "field1", "type=keyword,store=true", "field2", "type=keyword,store=true")
                .setSettings(Settings.builder().put("index.refresh_interval", -1))
                .addAlias(new Alias("alias")));
        ensureGreen();

        GetResponse response = client().prepareGet(indexOrAlias(), "type1", "1").get();
        assertThat(response.isExists(), equalTo(false));

        logger.info("--> index doc 1");
        client().prepareIndex("test", "type1", "1").setSource("field1", "value1", "field2", "value2").get();

        logger.info("--> non realtime get 1");
        response = client().prepareGet(indexOrAlias(), "type1", "1").setRealtime(false).get();
        assertThat(response.isExists(), equalTo(false));

        logger.info("--> realtime get 1");
        response = client().prepareGet(indexOrAlias(), "type1", "1").get();
        assertThat(response.isExists(), equalTo(true));
        assertThat(response.getIndex(), equalTo("test"));
        assertThat(response.getSourceAsMap().get("field1").toString(), equalTo("value1"));
        assertThat(response.getSourceAsMap().get("field2").toString(), equalTo("value2"));

        logger.info("--> realtime get 1 (no source, implicit)");
        response = client().prepareGet(indexOrAlias(), "type1", "1").setStoredFields(Strings.EMPTY_ARRAY).get();
        assertThat(response.isExists(), equalTo(true));
        assertThat(response.getIndex(), equalTo("test"));
        Set<String> fields = new HashSet<>(response.getFields().keySet());
        assertThat(fields, equalTo(Collections.<String>emptySet()));
        assertThat(response.getSourceAsBytes(), nullValue());

        logger.info("--> realtime get 1 (no source, explicit)");
        response = client().prepareGet(indexOrAlias(), "type1", "1").setFetchSource(false).get();
        assertThat(response.isExists(), equalTo(true));
        assertThat(response.getIndex(), equalTo("test"));
        fields = new HashSet<>(response.getFields().keySet());
        assertThat(fields, equalTo(Collections.<String>emptySet()));
        assertThat(response.getSourceAsBytes(), nullValue());

        logger.info("--> realtime get 1 (no type)");
        response = client().prepareGet(indexOrAlias(), null, "1").get();
        assertThat(response.isExists(), equalTo(true));
        assertThat(response.getIndex(), equalTo("test"));
        assertThat(response.getSourceAsMap().get("field1").toString(), equalTo("value1"));
        assertThat(response.getSourceAsMap().get("field2").toString(), equalTo("value2"));

        logger.info("--> realtime fetch of field");
        response = client().prepareGet(indexOrAlias(), "type1", "1").setStoredFields("field1").get();
        assertThat(response.isExists(), equalTo(true));
        assertThat(response.getIndex(), equalTo("test"));
        assertThat(response.getSourceAsBytes(), nullValue());
        assertThat(response.getField("field1").getValues().get(0).toString(), equalTo("value1"));
        assertThat(response.getField("field2"), nullValue());

        logger.info("--> realtime fetch of field & source");
        response = client().prepareGet(indexOrAlias(), "type1", "1")
            .setStoredFields("field1").setFetchSource("field1", null).get();
        assertThat(response.isExists(), equalTo(true));
        assertThat(response.getIndex(), equalTo("test"));
        assertThat(response.getSourceAsMap(), hasKey("field1"));
        assertThat(response.getSourceAsMap(), not(hasKey("field2")));
        assertThat(response.getField("field1").getValues().get(0).toString(), equalTo("value1"));
        assertThat(response.getField("field2"), nullValue());

        logger.info("--> flush the index, so we load it from it");
        flush();

        logger.info("--> realtime get 1 (loaded from index)");
        response = client().prepareGet(indexOrAlias(), "type1", "1").get();
        assertThat(response.isExists(), equalTo(true));
        assertThat(response.getIndex(), equalTo("test"));
        assertThat(response.getSourceAsMap().get("field1").toString(), equalTo("value1"));
        assertThat(response.getSourceAsMap().get("field2").toString(), equalTo("value2"));

        logger.info("--> non realtime get 1 (loaded from index)");
        response = client().prepareGet(indexOrAlias(), "type1", "1").setRealtime(false).get();
        assertThat(response.isExists(), equalTo(true));
        assertThat(response.getIndex(), equalTo("test"));
        assertThat(response.getSourceAsMap().get("field1").toString(), equalTo("value1"));
        assertThat(response.getSourceAsMap().get("field2").toString(), equalTo("value2"));

        logger.info("--> realtime fetch of field (loaded from index)");
        response = client().prepareGet(indexOrAlias(), "type1", "1").setStoredFields("field1").get();
        assertThat(response.isExists(), equalTo(true));
        assertThat(response.getIndex(), equalTo("test"));
        assertThat(response.getSourceAsBytes(), nullValue());
        assertThat(response.getField("field1").getValues().get(0).toString(), equalTo("value1"));
        assertThat(response.getField("field2"), nullValue());

        logger.info("--> realtime fetch of field & source (loaded from index)");
        response = client().prepareGet(indexOrAlias(), "type1", "1")
            .setStoredFields("field1").setFetchSource(true).get();
        assertThat(response.isExists(), equalTo(true));
        assertThat(response.getIndex(), equalTo("test"));
        assertThat(response.getSourceAsBytes(), not(nullValue()));
        assertThat(response.getField("field1").getValues().get(0).toString(), equalTo("value1"));
        assertThat(response.getField("field2"), nullValue());

        logger.info("--> update doc 1");
        client().prepareIndex("test", "type1", "1").setSource("field1", "value1_1", "field2", "value2_1").get();

        logger.info("--> realtime get 1");
        response = client().prepareGet(indexOrAlias(), "type1", "1").get();
        assertThat(response.isExists(), equalTo(true));
        assertThat(response.getIndex(), equalTo("test"));
        assertThat(response.getSourceAsMap().get("field1").toString(), equalTo("value1_1"));
        assertThat(response.getSourceAsMap().get("field2").toString(), equalTo("value2_1"));

        logger.info("--> update doc 1 again");
        client().prepareIndex("test", "type1", "1").setSource("field1", "value1_2", "field2", "value2_2").get();

        response = client().prepareGet(indexOrAlias(), "type1", "1").get();
        assertThat(response.isExists(), equalTo(true));
        assertThat(response.getIndex(), equalTo("test"));
        assertThat(response.getSourceAsMap().get("field1").toString(), equalTo("value1_2"));
        assertThat(response.getSourceAsMap().get("field2").toString(), equalTo("value2_2"));

        DeleteResponse deleteResponse = client().prepareDelete("test", "type1", "1").get();
        assertEquals(DocWriteResponse.Result.DELETED, deleteResponse.getResult());

        response = client().prepareGet(indexOrAlias(), "type1", "1").get();
        assertThat(response.isExists(), equalTo(false));
    }

    private static String indexOrAlias() {
        return randomBoolean() ? "test" : "alias";
    }

    public void testSimpleMultiGet() throws Exception {
        assertAcked(prepareCreate("test").addAlias(new Alias("alias"))
                .addMapping("type1", "field", "type=keyword,store=true")
                .setSettings(Settings.builder().put("index.refresh_interval", -1)));
        ensureGreen();

        MultiGetResponse response = client().prepareMultiGet().add(indexOrAlias(), "type1", "1").get();
        assertThat(response.getResponses().length, equalTo(1));
        assertThat(response.getResponses()[0].getResponse().isExists(), equalTo(false));

        for (int i = 0; i < 10; i++) {
            client().prepareIndex("test", "type1", Integer.toString(i)).setSource("field", "value" + i).get();
        }

        response = client().prepareMultiGet()
                .add(indexOrAlias(), "type1", "1")
                .add(indexOrAlias(), "type1", "15")
                .add(indexOrAlias(), "type1", "3")
                .add(indexOrAlias(), "type1", "9")
                .add(indexOrAlias(), "type1", "11").get();
        assertThat(response.getResponses().length, equalTo(5));
        assertThat(response.getResponses()[0].getId(), equalTo("1"));
        assertThat(response.getResponses()[0].getIndex(), equalTo("test"));
        assertThat(response.getResponses()[0].getResponse().getIndex(), equalTo("test"));
        assertThat(response.getResponses()[0].getResponse().isExists(), equalTo(true));
        assertThat(response.getResponses()[0].getResponse().getSourceAsMap().get("field").toString(), equalTo("value1"));
        assertThat(response.getResponses()[1].getId(), equalTo("15"));
        assertThat(response.getResponses()[1].getIndex(), equalTo("test"));
        assertThat(response.getResponses()[1].getResponse().getIndex(), equalTo("test"));
        assertThat(response.getResponses()[1].getResponse().isExists(), equalTo(false));
        assertThat(response.getResponses()[2].getId(), equalTo("3"));
        assertThat(response.getResponses()[2].getIndex(), equalTo("test"));
        assertThat(response.getResponses()[2].getResponse().isExists(), equalTo(true));
        assertThat(response.getResponses()[3].getId(), equalTo("9"));
        assertThat(response.getResponses()[3].getIndex(), equalTo("test"));
        assertThat(response.getResponses()[3].getResponse().getIndex(), equalTo("test"));
        assertThat(response.getResponses()[3].getResponse().isExists(), equalTo(true));
        assertThat(response.getResponses()[4].getId(), equalTo("11"));
        assertThat(response.getResponses()[4].getIndex(), equalTo("test"));
        assertThat(response.getResponses()[4].getResponse().getIndex(), equalTo("test"));
        assertThat(response.getResponses()[4].getResponse().isExists(), equalTo(false));

        // multi get with specific field
        response = client().prepareMultiGet()
                .add(new MultiGetRequest.Item(indexOrAlias(), "type1", "1").storedFields("field"))
                .add(new MultiGetRequest.Item(indexOrAlias(), "type1", "3").storedFields("field"))
                .get();

        assertThat(response.getResponses().length, equalTo(2));
        assertThat(response.getResponses()[0].getResponse().getSourceAsBytes(), nullValue());
        assertThat(response.getResponses()[0].getResponse().getField("field").getValues().get(0).toString(), equalTo("value1"));
    }

    public void testGetDocWithMultivaluedFields() throws Exception {
        String mapping1 = Strings.toString(XContentFactory.jsonBuilder().startObject().startObject("type1")
                .startObject("properties")
                .startObject("field").field("type", "text").field("store", true).endObject()
                .endObject()
                .endObject().endObject());
        assertAcked(prepareCreate("test")
                .addMapping("type1", mapping1, XContentType.JSON));
        ensureGreen();

        GetResponse response = client().prepareGet("test", "type1", "1").get();
        assertThat(response.isExists(), equalTo(false));
        assertThat(response.isExists(), equalTo(false));

        client().prepareIndex("test", "type1", "1")
                .setSource(jsonBuilder().startObject().array("field", "1", "2").endObject()).get();

        response = client().prepareGet("test", "type1", "1").setStoredFields("field").get();
        assertThat(response.isExists(), equalTo(true));
        assertThat(response.getId(), equalTo("1"));
        assertThat(response.getType(), equalTo("type1"));
        Set<String> fields = new HashSet<>(response.getFields().keySet());
        assertThat(fields, equalTo(singleton("field")));
        assertThat(response.getFields().get("field").getValues().size(), equalTo(2));
        assertThat(response.getFields().get("field").getValues().get(0).toString(), equalTo("1"));
        assertThat(response.getFields().get("field").getValues().get(1).toString(), equalTo("2"));

        // Now test values being fetched from stored fields.
        refresh();
        response = client().prepareGet("test", "type1", "1").setStoredFields("field").get();
        assertThat(response.isExists(), equalTo(true));
        assertThat(response.getId(), equalTo("1"));
        fields = new HashSet<>(response.getFields().keySet());
        assertThat(fields, equalTo(singleton("field")));
        assertThat(response.getFields().get("field").getValues().size(), equalTo(2));
        assertThat(response.getFields().get("field").getValues().get(0).toString(), equalTo("1"));
        assertThat(response.getFields().get("field").getValues().get(1).toString(), equalTo("2"));
    }

    public void testGetDocWithMultivaluedFieldsMultiTypeBWC() throws Exception {
        assertTrue("remove this multi type test", Version.CURRENT.before(Version.fromString("7.0.0")));
        String mapping1 = Strings.toString(XContentFactory.jsonBuilder().startObject().startObject("type1")
            .startObject("properties")
            .startObject("field").field("type", "text").field("store", true).endObject()
            .endObject()
            .endObject().endObject());
        String mapping2 = Strings.toString(XContentFactory.jsonBuilder().startObject().startObject("type2")
            .startObject("properties")
            .startObject("field").field("type", "text").field("store", true).endObject()
            .endObject()
            .endObject().endObject());
        assertAcked(prepareCreate("test")
            .addMapping("type1", mapping1, XContentType.JSON)
            .addMapping("type2", mapping2, XContentType.JSON)
            // multi types in 5.6
            .setSettings(Settings.builder().put("index.refresh_interval", -1).put("index.version.created", Version.V_5_6_0.id)));

        ensureGreen();

        GetResponse response = client().prepareGet("test", "type1", "1").get();
        assertThat(response.isExists(), equalTo(false));
        response = client().prepareGet("test", "type2", "1").get();
        assertThat(response.isExists(), equalTo(false));

        client().prepareIndex("test", "type1", "1")
            .setSource(jsonBuilder().startObject().array("field", "1", "2").endObject()).get();

        client().prepareIndex("test", "type2", "1")
            .setSource(jsonBuilder().startObject().array("field", "1", "2").endObject()).get();

        response = client().prepareGet("test", "type1", "1").setStoredFields("field").get();
        assertThat(response.isExists(), equalTo(true));
        assertThat(response.getId(), equalTo("1"));
        assertThat(response.getType(), equalTo("type1"));
        Set<String> fields = new HashSet<>(response.getFields().keySet());
        assertThat(fields, equalTo(singleton("field")));
        assertThat(response.getFields().get("field").getValues().size(), equalTo(2));
        assertThat(response.getFields().get("field").getValues().get(0).toString(), equalTo("1"));
        assertThat(response.getFields().get("field").getValues().get(1).toString(), equalTo("2"));


        response = client().prepareGet("test", "type2", "1").setStoredFields("field").get();
        assertThat(response.isExists(), equalTo(true));
        assertThat(response.getType(), equalTo("type2"));
        assertThat(response.getId(), equalTo("1"));
        fields = new HashSet<>(response.getFields().keySet());
        assertThat(fields, equalTo(singleton("field")));
        assertThat(response.getFields().get("field").getValues().size(), equalTo(2));
        assertThat(response.getFields().get("field").getValues().get(0).toString(), equalTo("1"));
        assertThat(response.getFields().get("field").getValues().get(1).toString(), equalTo("2"));

        // Now test values being fetched from stored fields.
        refresh();
        response = client().prepareGet("test", "type1", "1").setStoredFields("field").get();
        assertThat(response.isExists(), equalTo(true));
        assertThat(response.getId(), equalTo("1"));
        fields = new HashSet<>(response.getFields().keySet());
        assertThat(fields, equalTo(singleton("field")));
        assertThat(response.getFields().get("field").getValues().size(), equalTo(2));
        assertThat(response.getFields().get("field").getValues().get(0).toString(), equalTo("1"));
        assertThat(response.getFields().get("field").getValues().get(1).toString(), equalTo("2"));

        response = client().prepareGet("test", "type2", "1").setStoredFields("field").get();
        assertThat(response.isExists(), equalTo(true));
        assertThat(response.getId(), equalTo("1"));
        fields = new HashSet<>(response.getFields().keySet());
        assertThat(fields, equalTo(singleton("field")));
        assertThat(response.getFields().get("field").getValues().size(), equalTo(2));
        assertThat(response.getFields().get("field").getValues().get(0).toString(), equalTo("1"));
        assertThat(response.getFields().get("field").getValues().get(1).toString(), equalTo("2"));
    }

    public void testGetWithVersion() {
        assertAcked(prepareCreate("test").addAlias(new Alias("alias"))
                .setSettings(Settings.builder().put("index.refresh_interval", -1)));
        ensureGreen();

        GetResponse response = client().prepareGet("test", "type1", "1").get();
        assertThat(response.isExists(), equalTo(false));

        logger.info("--> index doc 1");
        client().prepareIndex("test", "type1", "1").setSource("field1", "value1", "field2", "value2").get();

        // From translog:

        response = client().prepareGet(indexOrAlias(), "type1", "1").setVersion(Versions.MATCH_ANY).get();
        assertThat(response.isExists(), equalTo(true));
        assertThat(response.getId(), equalTo("1"));
        assertThat(response.getVersion(), equalTo(1L));

        response = client().prepareGet(indexOrAlias(), "type1", "1").setVersion(1).get();
        assertThat(response.isExists(), equalTo(true));
        assertThat(response.getId(), equalTo("1"));
        assertThat(response.getVersion(), equalTo(1L));

        try {
            client().prepareGet(indexOrAlias(), "type1", "1").setVersion(2).get();
            fail();
        } catch (VersionConflictEngineException e) {
            //all good
        }

        // From Lucene index:
        refresh();

        response = client().prepareGet(indexOrAlias(), "type1", "1").setVersion(Versions.MATCH_ANY).setRealtime(false).get();
        assertThat(response.isExists(), equalTo(true));
        assertThat(response.getId(), equalTo("1"));
        assertThat(response.getIndex(), equalTo("test"));
        assertThat(response.getVersion(), equalTo(1L));

        response = client().prepareGet(indexOrAlias(), "type1", "1").setVersion(1).setRealtime(false).get();
        assertThat(response.isExists(), equalTo(true));
        assertThat(response.getId(), equalTo("1"));
        assertThat(response.getIndex(), equalTo("test"));
        assertThat(response.getVersion(), equalTo(1L));

        try {
            client().prepareGet(indexOrAlias(), "type1", "1").setVersion(2).setRealtime(false).get();
            fail();
        } catch (VersionConflictEngineException e) {
            //all good
        }

        logger.info("--> index doc 1 again, so increasing the version");
        client().prepareIndex("test", "type1", "1").setSource("field1", "value1", "field2", "value2").get();

        // From translog:

        response = client().prepareGet(indexOrAlias(), "type1", "1").setVersion(Versions.MATCH_ANY).get();
        assertThat(response.isExists(), equalTo(true));
        assertThat(response.getId(), equalTo("1"));
        assertThat(response.getIndex(), equalTo("test"));
        assertThat(response.getVersion(), equalTo(2L));

        try {
            client().prepareGet(indexOrAlias(), "type1", "1").setVersion(1).get();
            fail();
        } catch (VersionConflictEngineException e) {
            //all good
        }

        response = client().prepareGet(indexOrAlias(), "type1", "1").setVersion(2).get();
        assertThat(response.isExists(), equalTo(true));
        assertThat(response.getId(), equalTo("1"));
        assertThat(response.getIndex(), equalTo("test"));
        assertThat(response.getVersion(), equalTo(2L));

        // From Lucene index:
        refresh();

        response = client().prepareGet(indexOrAlias(), "type1", "1").setVersion(Versions.MATCH_ANY).setRealtime(false).get();
        assertThat(response.isExists(), equalTo(true));
        assertThat(response.getId(), equalTo("1"));
        assertThat(response.getIndex(), equalTo("test"));
        assertThat(response.getVersion(), equalTo(2L));

        try {
            client().prepareGet(indexOrAlias(), "type1", "1").setVersion(1).setRealtime(false).get();
            fail();
        } catch (VersionConflictEngineException e) {
            //all good
        }

        response = client().prepareGet(indexOrAlias(), "type1", "1").setVersion(2).setRealtime(false).get();
        assertThat(response.isExists(), equalTo(true));
        assertThat(response.getId(), equalTo("1"));
        assertThat(response.getIndex(), equalTo("test"));
        assertThat(response.getVersion(), equalTo(2L));
    }

    public void testMultiGetWithVersion() throws Exception {
        assertAcked(prepareCreate("test").addAlias(new Alias("alias"))
                .setSettings(Settings.builder().put("index.refresh_interval", -1)));
        ensureGreen();

        MultiGetResponse response = client().prepareMultiGet().add(indexOrAlias(), "type1", "1").get();
        assertThat(response.getResponses().length, equalTo(1));
        assertThat(response.getResponses()[0].getResponse().isExists(), equalTo(false));

        for (int i = 0; i < 3; i++) {
            client().prepareIndex("test", "type1", Integer.toString(i)).setSource("field", "value" + i).get();
        }

        // Version from translog
        response = client().prepareMultiGet()
                .add(new MultiGetRequest.Item(indexOrAlias(), "type1", "1").version(Versions.MATCH_ANY))
                .add(new MultiGetRequest.Item(indexOrAlias(), "type1", "1").version(1))
                .add(new MultiGetRequest.Item(indexOrAlias(), "type1", "1").version(2))
                .get();
        assertThat(response.getResponses().length, equalTo(3));
        // [0] version doesn't matter, which is the default
        assertThat(response.getResponses()[0].getFailure(), nullValue());
        assertThat(response.getResponses()[0].getId(), equalTo("1"));
        assertThat(response.getResponses()[0].getIndex(), equalTo("test"));
        assertThat(response.getResponses()[0].getResponse().isExists(), equalTo(true));
        assertThat(response.getResponses()[0].getResponse().getSourceAsMap().get("field").toString(), equalTo("value1"));
        assertThat(response.getResponses()[1].getId(), equalTo("1"));
        assertThat(response.getResponses()[1].getIndex(), equalTo("test"));
        assertThat(response.getResponses()[1].getFailure(), nullValue());
        assertThat(response.getResponses()[1].getResponse().isExists(), equalTo(true));
        assertThat(response.getResponses()[1].getResponse().getSourceAsMap().get("field").toString(), equalTo("value1"));
        assertThat(response.getResponses()[2].getFailure(), notNullValue());
        assertThat(response.getResponses()[2].getFailure().getId(), equalTo("1"));
        assertThat(response.getResponses()[2].getFailure().getMessage(), startsWith("[type1][1]: version conflict"));
        assertThat(response.getResponses()[2].getFailure().getFailure(), instanceOf(VersionConflictEngineException.class));

        //Version from Lucene index
        refresh();
        response = client().prepareMultiGet()
                .add(new MultiGetRequest.Item(indexOrAlias(), "type1", "1").version(Versions.MATCH_ANY))
                .add(new MultiGetRequest.Item(indexOrAlias(), "type1", "1").version(1))
                .add(new MultiGetRequest.Item(indexOrAlias(), "type1", "1").version(2))
                .setRealtime(false)
                .get();
        assertThat(response.getResponses().length, equalTo(3));
        // [0] version doesn't matter, which is the default
        assertThat(response.getResponses()[0].getFailure(), nullValue());
        assertThat(response.getResponses()[0].getId(), equalTo("1"));
        assertThat(response.getResponses()[0].getResponse().isExists(), equalTo(true));
        assertThat(response.getResponses()[0].getResponse().getSourceAsMap().get("field").toString(), equalTo("value1"));
        assertThat(response.getResponses()[1].getId(), equalTo("1"));
        assertThat(response.getResponses()[1].getFailure(), nullValue());
        assertThat(response.getResponses()[1].getResponse().isExists(), equalTo(true));
        assertThat(response.getResponses()[1].getResponse().getSourceAsMap().get("field").toString(), equalTo("value1"));
        assertThat(response.getResponses()[2].getFailure(), notNullValue());
        assertThat(response.getResponses()[2].getFailure().getId(), equalTo("1"));
        assertThat(response.getResponses()[2].getFailure().getMessage(), startsWith("[type1][1]: version conflict"));
        assertThat(response.getResponses()[2].getFailure().getFailure(), instanceOf(VersionConflictEngineException.class));



        for (int i = 0; i < 3; i++) {
            client().prepareIndex("test", "type1", Integer.toString(i)).setSource("field", "value" + i).get();
        }

        // Version from translog
        response = client().prepareMultiGet()
                .add(new MultiGetRequest.Item(indexOrAlias(), "type1", "2").version(Versions.MATCH_ANY))
                .add(new MultiGetRequest.Item(indexOrAlias(), "type1", "2").version(1))
                .add(new MultiGetRequest.Item(indexOrAlias(), "type1", "2").version(2))
                .get();
        assertThat(response.getResponses().length, equalTo(3));
        // [0] version doesn't matter, which is the default
        assertThat(response.getResponses()[0].getFailure(), nullValue());
        assertThat(response.getResponses()[0].getId(), equalTo("2"));
        assertThat(response.getResponses()[0].getIndex(), equalTo("test"));
        assertThat(response.getResponses()[0].getResponse().isExists(), equalTo(true));
        assertThat(response.getResponses()[0].getResponse().getSourceAsMap().get("field").toString(), equalTo("value2"));
        assertThat(response.getResponses()[1].getFailure(), notNullValue());
        assertThat(response.getResponses()[1].getFailure().getId(), equalTo("2"));
        assertThat(response.getResponses()[1].getIndex(), equalTo("test"));
        assertThat(response.getResponses()[1].getFailure().getMessage(), startsWith("[type1][2]: version conflict"));
        assertThat(response.getResponses()[2].getId(), equalTo("2"));
        assertThat(response.getResponses()[2].getIndex(), equalTo("test"));
        assertThat(response.getResponses()[2].getFailure(), nullValue());
        assertThat(response.getResponses()[2].getResponse().isExists(), equalTo(true));
        assertThat(response.getResponses()[2].getResponse().getSourceAsMap().get("field").toString(), equalTo("value2"));


        //Version from Lucene index
        refresh();
        response = client().prepareMultiGet()
                .add(new MultiGetRequest.Item(indexOrAlias(), "type1", "2").version(Versions.MATCH_ANY))
                .add(new MultiGetRequest.Item(indexOrAlias(), "type1", "2").version(1))
                .add(new MultiGetRequest.Item(indexOrAlias(), "type1", "2").version(2))
                .setRealtime(false)
                .get();
        assertThat(response.getResponses().length, equalTo(3));
        // [0] version doesn't matter, which is the default
        assertThat(response.getResponses()[0].getFailure(), nullValue());
        assertThat(response.getResponses()[0].getId(), equalTo("2"));
        assertThat(response.getResponses()[0].getIndex(), equalTo("test"));
        assertThat(response.getResponses()[0].getResponse().isExists(), equalTo(true));
        assertThat(response.getResponses()[0].getResponse().getSourceAsMap().get("field").toString(), equalTo("value2"));
        assertThat(response.getResponses()[1].getFailure(), notNullValue());
        assertThat(response.getResponses()[1].getFailure().getId(), equalTo("2"));
        assertThat(response.getResponses()[1].getIndex(), equalTo("test"));
        assertThat(response.getResponses()[1].getFailure().getMessage(), startsWith("[type1][2]: version conflict"));
        assertThat(response.getResponses()[2].getId(), equalTo("2"));
        assertThat(response.getResponses()[2].getIndex(), equalTo("test"));
        assertThat(response.getResponses()[2].getFailure(), nullValue());
        assertThat(response.getResponses()[2].getResponse().isExists(), equalTo(true));
        assertThat(response.getResponses()[2].getResponse().getSourceAsMap().get("field").toString(), equalTo("value2"));
    }

    public void testGetFieldsMetaDataWithRouting() throws Exception {
        assertAcked(prepareCreate("test")
            .addMapping("_doc", "field1", "type=keyword,store=true")
            .addAlias(new Alias("alias"))
            .setSettings(Settings.builder().put("index.refresh_interval", -1).put("index.version.created", Version.V_5_6_0.id)));
            // multi types in 5.6

        client().prepareIndex("test", "_doc", "1")
            .setRouting("1")
            .setSource(jsonBuilder().startObject().field("field1", "value").endObject())
            .get();

        GetResponse getResponse = client().prepareGet(indexOrAlias(), "_doc", "1")
            .setRouting("1")
            .setStoredFields("field1")
            .get();
        assertThat(getResponse.isExists(), equalTo(true));
        assertThat(getResponse.getField("field1").isMetadataField(), equalTo(false));
        assertThat(getResponse.getField("field1").getValue().toString(), equalTo("value"));
        assertThat(getResponse.getField("_routing").isMetadataField(), equalTo(true));
        assertThat(getResponse.getField("_routing").getValue().toString(), equalTo("1"));

        flush();

        getResponse = client().prepareGet(indexOrAlias(), "_doc", "1")
            .setStoredFields("field1")
            .setRouting("1")
            .get();
        assertThat(getResponse.isExists(), equalTo(true));
        assertThat(getResponse.getField("field1").isMetadataField(), equalTo(false));
        assertThat(getResponse.getField("field1").getValue().toString(), equalTo("value"));
        assertThat(getResponse.getField("_routing").isMetadataField(), equalTo(true));
        assertThat(getResponse.getField("_routing").getValue().toString(), equalTo("1"));
    }

    public void testGetFieldsMetaDataWithParentChild() throws Exception {
        assertTrue("remove this multi type test", Version.CURRENT.before(Version.fromString("7.0.0")));
        assertAcked(prepareCreate("test")
                .addMapping("parent")
                .addMapping("my-type1", "_parent", "type=parent", "field1", "type=keyword,store=true")
                .addAlias(new Alias("alias"))
                .setSettings(Settings.builder().put("index.refresh_interval", -1).put("index.version.created", Version.V_5_6_0.id)));
                // multi types in 5.6

        client().prepareIndex("test", "my-type1", "1")
                .setRouting("1")
                .setParent("parent_1")
                .setSource(jsonBuilder().startObject().field("field1", "value").endObject())
                .get();

        GetResponse getResponse = client().prepareGet(indexOrAlias(), "my-type1", "1")
                .setRouting("1")
                .setStoredFields("field1")
                .get();
        assertThat(getResponse.isExists(), equalTo(true));
        assertThat(getResponse.getField("field1").isMetadataField(), equalTo(false));
        assertThat(getResponse.getField("field1").getValue().toString(), equalTo("value"));
        assertThat(getResponse.getField("_routing").isMetadataField(), equalTo(true));
        assertThat(getResponse.getField("_routing").getValue().toString(), equalTo("1"));
        assertThat(getResponse.getField("_parent").isMetadataField(), equalTo(true));
        assertThat(getResponse.getField("_parent").getValue().toString(), equalTo("parent_1"));

        flush();

        getResponse = client().prepareGet(indexOrAlias(), "my-type1", "1")
                .setStoredFields("field1")
                .setRouting("1")
                .get();
        assertThat(getResponse.isExists(), equalTo(true));
        assertThat(getResponse.getField("field1").isMetadataField(), equalTo(false));
        assertThat(getResponse.getField("field1").getValue().toString(), equalTo("value"));
        assertThat(getResponse.getField("_routing").isMetadataField(), equalTo(true));
        assertThat(getResponse.getField("_routing").getValue().toString(), equalTo("1"));
        assertThat(getResponse.getField("_parent").isMetadataField(), equalTo(true));
        assertThat(getResponse.getField("_parent").getValue().toString(), equalTo("parent_1"));
    }

    public void testGetFieldsNonLeafField() throws Exception {
        assertAcked(prepareCreate("test").addAlias(new Alias("alias"))
                .addMapping("my-type1", jsonBuilder().startObject().startObject("my-type1").startObject("properties")
                        .startObject("field1").startObject("properties")
                        .startObject("field2").field("type", "text").endObject()
                        .endObject().endObject()
                        .endObject().endObject().endObject())
                .setSettings(Settings.builder().put("index.refresh_interval", -1)));

        client().prepareIndex("test", "my-type1", "1")
                .setSource(jsonBuilder().startObject().startObject("field1").field("field2", "value1").endObject().endObject())
                .get();


        IllegalArgumentException exc =
            expectThrows(IllegalArgumentException.class,
                () -> client().prepareGet(indexOrAlias(), "my-type1", "1").setStoredFields("field1").get());
        assertThat(exc.getMessage(), equalTo("field [field1] isn't a leaf field"));

        flush();

        exc =
            expectThrows(IllegalArgumentException.class,
                () -> client().prepareGet(indexOrAlias(), "my-type1", "1").setStoredFields("field1").get());
        assertThat(exc.getMessage(), equalTo("field [field1] isn't a leaf field"));
    }

    public void testGetFieldsComplexField() throws Exception {
        assertAcked(prepareCreate("my-index")
            // multi types in 5.6
            .setSettings(Settings.builder().put("index.refresh_interval", -1).put("index.version.created", Version.V_5_6_0.id))
                .addMapping("my-type2", jsonBuilder().startObject().startObject("my-type2").startObject("properties")
                        .startObject("field1").field("type", "object").startObject("properties")
                        .startObject("field2").field("type", "object").startObject("properties")
                                .startObject("field3").field("type", "object").startObject("properties")
                                    .startObject("field4").field("type", "text").field("store", true)
                                .endObject().endObject()
                            .endObject().endObject()
                        .endObject().endObject().endObject()
                        .endObject().endObject().endObject()));

        BytesReference source = BytesReference.bytes(jsonBuilder().startObject()
                    .startArray("field1")
                        .startObject()
                            .startObject("field2")
                                .startArray("field3")
                                    .startObject()
                                        .field("field4", "value1")
                                    .endObject()
                                .endArray()
                            .endObject()
                        .endObject()
                        .startObject()
                            .startObject("field2")
                                .startArray("field3")
                                    .startObject()
                                        .field("field4", "value2")
                                    .endObject()
                                .endArray()
                            .endObject()
                        .endObject()
                    .endArray()
                .endObject());

        logger.info("indexing documents");

        client().prepareIndex("my-index", "my-type1", "1").setSource(source, XContentType.JSON).get();
        client().prepareIndex("my-index", "my-type2", "1").setSource(source, XContentType.JSON).get();

        logger.info("checking real time retrieval");

        String field = "field1.field2.field3.field4";
        GetResponse getResponse = client().prepareGet("my-index", "my-type1", "1").setStoredFields(field).get();
        assertThat(getResponse.isExists(), equalTo(true));
        assertThat(getResponse.getField(field).isMetadataField(), equalTo(false));
        assertThat(getResponse.getField(field).getValues().size(), equalTo(2));
        assertThat(getResponse.getField(field).getValues().get(0).toString(), equalTo("value1"));
        assertThat(getResponse.getField(field).getValues().get(1).toString(), equalTo("value2"));

        getResponse = client().prepareGet("my-index", "my-type2", "1").setStoredFields(field).get();
        assertThat(getResponse.isExists(), equalTo(true));
        assertThat(getResponse.getField(field).isMetadataField(), equalTo(false));
        assertThat(getResponse.getField(field).getValues().size(), equalTo(2));
        assertThat(getResponse.getField(field).getValues().get(0).toString(), equalTo("value1"));
        assertThat(getResponse.getField(field).getValues().get(1).toString(), equalTo("value2"));

        logger.info("waiting for recoveries to complete");

        // Flush fails if shard has ongoing recoveries, make sure the cluster is settled down
        ensureGreen();

        logger.info("flushing");
        FlushResponse flushResponse = client().admin().indices().prepareFlush("my-index").setForce(true).get();
        if (flushResponse.getSuccessfulShards() == 0) {
            StringBuilder sb = new StringBuilder("failed to flush at least one shard. total shards [")
                    .append(flushResponse.getTotalShards()).append("], failed shards: [").append(flushResponse.getFailedShards()).append("]");
            for (DefaultShardOperationFailedException failure: flushResponse.getShardFailures()) {
                sb.append("\nShard failure: ").append(failure);
            }
            fail(sb.toString());
        }

        logger.info("checking post-flush retrieval");

        getResponse = client().prepareGet("my-index", "my-type1", "1").setStoredFields(field).get();
        assertThat(getResponse.isExists(), equalTo(true));
        assertThat(getResponse.getField(field).isMetadataField(), equalTo(false));
        assertThat(getResponse.getField(field).getValues().size(), equalTo(2));
        assertThat(getResponse.getField(field).getValues().get(0).toString(), equalTo("value1"));
        assertThat(getResponse.getField(field).getValues().get(1).toString(), equalTo("value2"));

        getResponse = client().prepareGet("my-index", "my-type2", "1").setStoredFields(field).get();
        assertThat(getResponse.isExists(), equalTo(true));
        assertThat(getResponse.getField(field).isMetadataField(), equalTo(false));
        assertThat(getResponse.getField(field).getValues().size(), equalTo(2));
        assertThat(getResponse.getField(field).getValues().get(0).toString(), equalTo("value1"));
        assertThat(getResponse.getField(field).getValues().get(1).toString(), equalTo("value2"));
    }

    public void testUngeneratedFieldsThatAreNeverStored() throws IOException {
        String createIndexSource = "{\n" +
                "  \"settings\": {\n" +
                "    \"index.translog.flush_threshold_size\": \"1pb\",\n" +
                "    \"refresh_interval\": \"-1\"\n" +
                "  },\n" +
                "  \"mappings\": {\n" +
                "    \"_doc\": {\n" +
                "      \"properties\": {\n" +
                "        \"suggest\": {\n" +
                "          \"type\": \"completion\"\n" +
                "        }\n" +
                "      }\n" +
                "    }\n" +
                "  }\n" +
                "}";
        assertAcked(prepareCreate("test").addAlias(new Alias("alias")).setSource(createIndexSource, XContentType.JSON));
        ensureGreen();
        String doc = "{\n" +
                "  \"suggest\": {\n" +
                "    \"input\": [\n" +
                "      \"Nevermind\",\n" +
                "      \"Nirvana\"\n" +
                "    ]\n" +
                "  }\n" +
                "}";

        index("test", "_doc", "1", doc);
        String[] fieldsList = {"suggest"};
        // before refresh - document is only in translog
        assertGetFieldsAlwaysNull(indexOrAlias(), "_doc", "1", fieldsList);
        refresh();
        //after refresh - document is in translog and also indexed
        assertGetFieldsAlwaysNull(indexOrAlias(), "_doc", "1", fieldsList);
        flush();
        //after flush - document is in not anymore translog - only indexed
        assertGetFieldsAlwaysNull(indexOrAlias(), "_doc", "1", fieldsList);
    }

    public void testUngeneratedFieldsThatAreAlwaysStored() throws IOException {
        String createIndexSource = "{\n" +
                "  \"settings\": {\n" +
                "    \"index.translog.flush_threshold_size\": \"1pb\",\n" +
                "    \"refresh_interval\": \"-1\"\n" +
                "  }\n" +
                "}";
        assertAcked(prepareCreate("test")
                .addAlias(new Alias("alias")).setSource(createIndexSource, XContentType.JSON));
        ensureGreen();

        client().prepareIndex("test", "_doc", "1").setRouting("routingValue").setId("1").setSource("{}", XContentType.JSON).get();

        String[] fieldsList = {"_routing"};
        // before refresh - document is only in translog
        assertGetFieldsAlwaysWorks(indexOrAlias(), "_doc", "1", fieldsList, "routingValue");
        refresh();
        //after refresh - document is in translog and also indexed
        assertGetFieldsAlwaysWorks(indexOrAlias(), "_doc", "1", fieldsList, "routingValue");
        flush();
        //after flush - document is in not anymore translog - only indexed
        assertGetFieldsAlwaysWorks(indexOrAlias(), "_doc", "1", fieldsList, "routingValue");
    }

    public void testUngeneratedFieldsNotPartOfSourceStored() throws IOException {
        String createIndexSource = "{\n" +
            "  \"settings\": {\n" +
            "    \"index.translog.flush_threshold_size\": \"1pb\",\n" +
            "    \"refresh_interval\": \"-1\"\n" +
            "  }\n" +
            "}";

        assertAcked(prepareCreate("test").addAlias(new Alias("alias")).setSource(createIndexSource, XContentType.JSON));
        ensureGreen();
        String doc = "{\n" +
            "  \"text\": \"some text.\"\n" +
            "}\n";
        client().prepareIndex("test", "_doc").setId("1").setSource(doc, XContentType.JSON).setRouting("1").get();
        String[] fieldsList = {"_routing"};
        // before refresh - document is only in translog
        assertGetFieldsAlwaysWorks(indexOrAlias(), "_doc", "1", fieldsList, "1");
        refresh();
        //after refresh - document is in translog and also indexed
        assertGetFieldsAlwaysWorks(indexOrAlias(), "_doc", "1", fieldsList, "1");
        flush();
        //after flush - document is in not anymore translog - only indexed
        assertGetFieldsAlwaysWorks(indexOrAlias(), "_doc", "1", fieldsList, "1");
    }

    public void testGeneratedStringFieldsUnstored() throws IOException {
        indexSingleDocumentWithStringFieldsGeneratedFromText(false, randomBoolean());
        String[] fieldsList = {"_field_names"};
        // before refresh - document is only in translog
        assertGetFieldsAlwaysNull(indexOrAlias(), "_doc", "1", fieldsList);
        refresh();
        //after refresh - document is in translog and also indexed
        assertGetFieldsAlwaysNull(indexOrAlias(), "_doc", "1", fieldsList);
        flush();
        //after flush - document is in not anymore translog - only indexed
        assertGetFieldsAlwaysNull(indexOrAlias(), "_doc", "1", fieldsList);
    }

    public void testGeneratedStringFieldsStored() throws IOException {
        indexSingleDocumentWithStringFieldsGeneratedFromText(true, randomBoolean());
        String[] fieldsList = {"text1", "text2"};
        String[] alwaysNotStoredFieldsList = {"_field_names"};
        assertGetFieldsAlwaysWorks(indexOrAlias(), "_doc", "1", fieldsList);
        assertGetFieldsNull(indexOrAlias(), "_doc", "1", alwaysNotStoredFieldsList);
        flush();
        //after flush - document is in not anymore translog - only indexed
        assertGetFieldsAlwaysWorks(indexOrAlias(), "_doc", "1", fieldsList);
        assertGetFieldsNull(indexOrAlias(), "_doc", "1", alwaysNotStoredFieldsList);
    }

    void indexSingleDocumentWithStringFieldsGeneratedFromText(boolean stored, boolean sourceEnabled) {

        String storedString = stored ? "true" : "false";
        String createIndexSource = "{\n" +
                "  \"settings\": {\n" +
                "    \"index.translog.flush_threshold_size\": \"1pb\",\n" +
                "    \"refresh_interval\": \"-1\"\n" +
                "  },\n" +
                "  \"mappings\": {\n" +
                "    \"_doc\": {\n" +
                "      \"_source\" : {\"enabled\" : " + sourceEnabled + "}," +
                "      \"properties\": {\n" +
                "        \"text1\": {\n" +
                "          \"type\": \"text\",\n" +
                "          \"store\": \"" + storedString + "\"" +
                "        },\n" +
                "        \"text2\": {\n" +
                "          \"type\": \"text\",\n" +
                "          \"store\": \"" + storedString + "\"" +
                "        }" +
                "      }\n" +
                "    }\n" +
                "  }\n" +
                "}";

        assertAcked(prepareCreate("test").addAlias(new Alias("alias")).setSource(createIndexSource, XContentType.JSON));
        ensureGreen();
        String doc = "{\n" +
                "  \"text1\": \"some text.\"\n," +
                "  \"text2\": \"more text.\"\n" +
                "}\n";
        index("test", "_doc", "1", doc);
    }

    private void assertGetFieldsAlwaysWorks(String index, String type, String docId, String[] fields) {
        assertGetFieldsAlwaysWorks(index, type, docId, fields, null);
    }

    private void assertGetFieldsAlwaysWorks(String index, String type, String docId, String[] fields, @Nullable String routing) {
        for (String field : fields) {
            assertGetFieldWorks(index, type, docId, field, routing);
            assertGetFieldWorks(index, type, docId, field, routing);
        }
    }

    private void assertGetFieldWorks(String index, String type, String docId, String field, @Nullable String routing) {
        GetResponse response = getDocument(index, type, docId, field, routing);
        assertThat(response.getId(), equalTo(docId));
        assertTrue(response.isExists());
        assertNotNull(response.getField(field));
        response = multiGetDocument(index, type, docId, field, routing);
        assertThat(response.getId(), equalTo(docId));
        assertTrue(response.isExists());
        assertNotNull(response.getField(field));
    }

    protected void assertGetFieldsNull(String index, String type, String docId, String[] fields) {
        assertGetFieldsNull(index, type, docId, fields, null);
    }

    protected void assertGetFieldsNull(String index, String type, String docId, String[] fields, @Nullable String routing) {
        for (String field : fields) {
            assertGetFieldNull(index, type, docId, field, routing);
        }
    }

    protected void assertGetFieldsAlwaysNull(String index, String type, String docId, String[] fields) {
        assertGetFieldsAlwaysNull(index, type, docId, fields, null);
    }

    protected void assertGetFieldsAlwaysNull(String index, String type, String docId, String[] fields, @Nullable String routing) {
        for (String field : fields) {
            assertGetFieldNull(index, type, docId, field, routing);
            assertGetFieldNull(index, type, docId, field, routing);
        }
    }

    protected void assertGetFieldNull(String index, String type, String docId, String field, @Nullable String routing) {
        //for get
        GetResponse response = getDocument(index, type, docId, field, routing);
        assertTrue(response.isExists());
        assertNull(response.getField(field));
        assertThat(response.getId(), equalTo(docId));
        //same for multi get
        response = multiGetDocument(index, type, docId, field, routing);
        assertNull(response.getField(field));
        assertThat(response.getId(), equalTo(docId));
        assertTrue(response.isExists());
    }

    private GetResponse multiGetDocument(String index, String type, String docId, String field, @Nullable String routing) {
      MultiGetRequest.Item getItem = new MultiGetRequest.Item(index, type, docId).storedFields(field);
        if (routing != null) {
            getItem.routing(routing);
        }
        MultiGetRequestBuilder multiGetRequestBuilder = client().prepareMultiGet().add(getItem);
        MultiGetResponse multiGetResponse = multiGetRequestBuilder.get();
        assertThat(multiGetResponse.getResponses().length, equalTo(1));
        return multiGetResponse.getResponses()[0].getResponse();
    }

    private GetResponse getDocument(String index, String type, String docId, String field, @Nullable String routing) {
        GetRequestBuilder getRequestBuilder = client().prepareGet().setIndex(index).setType(type).setId(docId).setStoredFields(field);
        if (routing != null) {
            getRequestBuilder.setRouting(routing);
        }
        return getRequestBuilder.get();
    }
}
