/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the Elastic License
 * 2.0 and the Server Side Public License, v 1; you may not use this file except
 * in compliance with, at your election, the Elastic License 2.0 or the Server
 * Side Public License, v 1.
 */

package org.elasticsearch.rest.action.cat;

import org.elasticsearch.action.admin.cluster.state.ClusterStateResponse;
import org.elasticsearch.action.admin.indices.settings.get.GetSettingsResponse;
import org.elasticsearch.action.admin.indices.stats.CommonStats;
import org.elasticsearch.action.admin.indices.stats.IndexStats;
import org.elasticsearch.action.admin.indices.stats.IndicesStatsResponse;
import org.elasticsearch.action.support.IndicesOptions;
import org.elasticsearch.action.support.RefCountingListener;
import org.elasticsearch.client.internal.node.NodeClient;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.health.ClusterHealthStatus;
import org.elasticsearch.cluster.health.ClusterIndexHealth;
import org.elasticsearch.cluster.metadata.IndexMetadata;
import org.elasticsearch.cluster.routing.IndexRoutingTable;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.Table;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.time.DateFormatter;
import org.elasticsearch.common.unit.ByteSizeValue;
import org.elasticsearch.core.TimeValue;
import org.elasticsearch.index.IndexSettings;
import org.elasticsearch.rest.RestRequest;
import org.elasticsearch.rest.RestResponse;
import org.elasticsearch.rest.Scope;
import org.elasticsearch.rest.ServerlessScope;
import org.elasticsearch.rest.action.RestResponseListener;

import java.time.Instant;
import java.time.ZoneOffset;
import java.time.ZonedDateTime;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.atomic.AtomicReference;

import static org.elasticsearch.action.support.master.MasterNodeRequest.DEFAULT_MASTER_NODE_TIMEOUT;
import static org.elasticsearch.common.util.set.Sets.addToCopy;
import static org.elasticsearch.rest.RestRequest.Method.GET;

@ServerlessScope(Scope.PUBLIC)
public class RestIndicesAction extends AbstractCatAction {

    private static final Set<String> RESPONSE_PARAMS = addToCopy(AbstractCatAction.RESPONSE_PARAMS, "local", "health");
    private static final DateFormatter STRICT_DATE_TIME_FORMATTER = DateFormatter.forPattern("strict_date_time");

    @Override
    public List<Route> routes() {
        return List.of(new Route(GET, "/_cat/indices"), new Route(GET, "/_cat/indices/{index}"));
    }

    @Override
    public String getName() {
        return "cat_indices_action";
    }

    @Override
    public boolean allowSystemIndexAccessByDefault() {
        return true;
    }

    @Override
    protected void documentation(StringBuilder sb) {
        sb.append("/_cat/indices\n");
        sb.append("/_cat/indices/{index}\n");
    }

    @Override
    public RestChannelConsumer doCatRequest(final RestRequest request, final NodeClient client) {
        final String[] indices = Strings.splitStringByCommaToArray(request.param("index"));
        final IndicesOptions indicesOptions = IndicesOptions.fromRequest(request, IndicesOptions.strictExpand());
        final TimeValue masterNodeTimeout = request.paramAsTime("master_timeout", DEFAULT_MASTER_NODE_TIMEOUT);
        final boolean includeUnloadedSegments = request.paramAsBoolean("include_unloaded_segments", false);

        return channel -> {
            final var indexSettingsRef = new AtomicReference<GetSettingsResponse>();
            final var indicesStatsRef = new AtomicReference<IndicesStatsResponse>();
            final var clusterStateRef = new AtomicReference<ClusterStateResponse>();

            try (var listeners = new RefCountingListener(new RestResponseListener<>(channel) {
                @Override
                public RestResponse buildResponse(Void ignored) throws Exception {
                    return RestTable.buildResponse(
                        buildTable(
                            request,
                            indexSettingsRef.get().getIndexToSettings(),
                            clusterStateRef.get().getState(),
                            indicesStatsRef.get().getIndices()
                        ),
                        channel
                    );
                }
            })) {
                // [NOTE: WHY GET SETTINGS] Use the Get Settings API to determine the indices we should return because:
                //
                // - the Cluster State API does not filter output based on index privileges, so they can't be used to determine which
                // indices are authorized or not.
                //
                // - the Indices Stats API does not provide information for all existing indices (for example recovering indices or
                // non-replicated closed indices are not reported in its response).
                //
                // Note that the user must be authorized to request the cluster state to use this API, which means they can use the cluster
                // state API to get a list of all the indices in the cluster anyway. Thus filtering out the unauthorized indices has limited
                // security benefits - it's more of a convenience thing.
                client.admin()
                    .indices()
                    .prepareGetSettings(indices)
                    .setIndicesOptions(indicesOptions)
                    .setMasterNodeTimeout(masterNodeTimeout)
                    .setNames(IndexSettings.INDEX_SEARCH_THROTTLED.getKey())
                    .execute(listeners.acquire(indexSettingsRef::set));

                // The other requests just provide additional detail, and wildcards may be resolved differently depending on the type of
                // request in the presence of security plugins, so set the IndicesOptions for all the sub-requests to be as inclusive as
                // possible.
                final IndicesOptions subRequestIndicesOptions = IndicesOptions.lenientExpandHidden();

                client.admin()
                    .cluster()
                    .prepareState()
                    .clear()
                    .setMetadata(true)
                    .setRoutingTable(true)
                    .setIndices(indices)
                    .setIndicesOptions(subRequestIndicesOptions)
                    .setMasterNodeTimeout(masterNodeTimeout)
                    .execute(listeners.acquire(clusterStateRef::set));

                client.admin()
                    .indices()
                    .prepareStats(indices)
                    .setIndicesOptions(subRequestIndicesOptions)
                    .all()
                    .setIncludeUnloadedSegments(includeUnloadedSegments)
                    .execute(listeners.acquire(indicesStatsRef::set));
            }
        };
    }

    @Override
    protected Set<String> responseParams() {
        return RESPONSE_PARAMS;
    }

    @Override
    protected Table getTableWithHeader(final RestRequest request) {
        Table table = new Table();
        table.startHeaders();
        table.addCell("health", "alias:h;desc:current health status");
        table.addCell("status", "alias:s;desc:open/close status");
        table.addCell("index", "alias:i,idx;desc:index name");
        table.addCell("uuid", "alias:id,uuid;desc:index uuid");
        table.addCell("pri", "alias:p,shards.primary,shardsPrimary;text-align:right;desc:number of primary shards");
        table.addCell("rep", "alias:r,shards.replica,shardsReplica;text-align:right;desc:number of replica shards");
        table.addCell("docs.count", "alias:dc,docsCount;text-align:right;desc:available docs");
        table.addCell("docs.deleted", "alias:dd,docsDeleted;text-align:right;desc:deleted docs");

        table.addCell("creation.date", "alias:cd;default:false;desc:index creation date (millisecond value)");
        table.addCell("creation.date.string", "alias:cds;default:false;desc:index creation date (as string)");

        table.addCell("store.size", "sibling:pri;alias:ss,storeSize;text-align:right;desc:store size of primaries & replicas");
        table.addCell("pri.store.size", "text-align:right;desc:store size of primaries");

        table.addCell("completion.size", "sibling:pri;alias:cs,completionSize;default:false;text-align:right;desc:size of completion");
        table.addCell("pri.completion.size", "default:false;text-align:right;desc:size of completion");

        table.addCell(
            "fielddata.memory_size",
            "sibling:pri;alias:fm,fielddataMemory;default:false;text-align:right;desc:used fielddata cache"
        );
        table.addCell("pri.fielddata.memory_size", "default:false;text-align:right;desc:used fielddata cache");

        table.addCell(
            "fielddata.evictions",
            "sibling:pri;alias:fe,fielddataEvictions;default:false;text-align:right;desc:fielddata evictions"
        );
        table.addCell("pri.fielddata.evictions", "default:false;text-align:right;desc:fielddata evictions");

        table.addCell(
            "query_cache.memory_size",
            "sibling:pri;alias:qcm,queryCacheMemory;default:false;text-align:right;desc:used query cache"
        );
        table.addCell("pri.query_cache.memory_size", "default:false;text-align:right;desc:used query cache");

        table.addCell(
            "query_cache.evictions",
            "sibling:pri;alias:qce,queryCacheEvictions;default:false;text-align:right;desc:query cache evictions"
        );
        table.addCell("pri.query_cache.evictions", "default:false;text-align:right;desc:query cache evictions");

        table.addCell(
            "request_cache.memory_size",
            "sibling:pri;alias:rcm,requestCacheMemory;default:false;text-align:right;desc:used request cache"
        );
        table.addCell("pri.request_cache.memory_size", "default:false;text-align:right;desc:used request cache");

        table.addCell(
            "request_cache.evictions",
            "sibling:pri;alias:rce,requestCacheEvictions;default:false;text-align:right;desc:request cache evictions"
        );
        table.addCell("pri.request_cache.evictions", "default:false;text-align:right;desc:request cache evictions");

        table.addCell(
            "request_cache.hit_count",
            "sibling:pri;alias:rchc,requestCacheHitCount;default:false;text-align:right;desc:request cache hit count"
        );
        table.addCell("pri.request_cache.hit_count", "default:false;text-align:right;desc:request cache hit count");

        table.addCell(
            "request_cache.miss_count",
            "sibling:pri;alias:rcmc,requestCacheMissCount;default:false;text-align:right;desc:request cache miss count"
        );
        table.addCell("pri.request_cache.miss_count", "default:false;text-align:right;desc:request cache miss count");

        table.addCell("flush.total", "sibling:pri;alias:ft,flushTotal;default:false;text-align:right;desc:number of flushes");
        table.addCell("pri.flush.total", "default:false;text-align:right;desc:number of flushes");

        table.addCell("flush.total_time", "sibling:pri;alias:ftt,flushTotalTime;default:false;text-align:right;desc:time spent in flush");
        table.addCell("pri.flush.total_time", "default:false;text-align:right;desc:time spent in flush");

        table.addCell("get.current", "sibling:pri;alias:gc,getCurrent;default:false;text-align:right;desc:number of current get ops");
        table.addCell("pri.get.current", "default:false;text-align:right;desc:number of current get ops");

        table.addCell("get.time", "sibling:pri;alias:gti,getTime;default:false;text-align:right;desc:time spent in get");
        table.addCell("pri.get.time", "default:false;text-align:right;desc:time spent in get");

        table.addCell("get.total", "sibling:pri;alias:gto,getTotal;default:false;text-align:right;desc:number of get ops");
        table.addCell("pri.get.total", "default:false;text-align:right;desc:number of get ops");

        table.addCell(
            "get.exists_time",
            "sibling:pri;alias:geti,getExistsTime;default:false;text-align:right;desc:time spent in successful gets"
        );
        table.addCell("pri.get.exists_time", "default:false;text-align:right;desc:time spent in successful gets");

        table.addCell(
            "get.exists_total",
            "sibling:pri;alias:geto,getExistsTotal;default:false;text-align:right;desc:number of successful gets"
        );
        table.addCell("pri.get.exists_total", "default:false;text-align:right;desc:number of successful gets");

        table.addCell(
            "get.missing_time",
            "sibling:pri;alias:gmti,getMissingTime;default:false;text-align:right;desc:time spent in failed gets"
        );
        table.addCell("pri.get.missing_time", "default:false;text-align:right;desc:time spent in failed gets");

        table.addCell(
            "get.missing_total",
            "sibling:pri;alias:gmto,getMissingTotal;default:false;text-align:right;desc:number of failed gets"
        );
        table.addCell("pri.get.missing_total", "default:false;text-align:right;desc:number of failed gets");

        table.addCell(
            "indexing.delete_current",
            "sibling:pri;alias:idc,indexingDeleteCurrent;default:false;text-align:right;desc:number of current deletions"
        );
        table.addCell("pri.indexing.delete_current", "default:false;text-align:right;desc:number of current deletions");

        table.addCell(
            "indexing.delete_time",
            "sibling:pri;alias:idti,indexingDeleteTime;default:false;text-align:right;desc:time spent in deletions"
        );
        table.addCell("pri.indexing.delete_time", "default:false;text-align:right;desc:time spent in deletions");

        table.addCell(
            "indexing.delete_total",
            "sibling:pri;alias:idto,indexingDeleteTotal;default:false;text-align:right;desc:number of delete ops"
        );
        table.addCell("pri.indexing.delete_total", "default:false;text-align:right;desc:number of delete ops");

        table.addCell(
            "indexing.index_current",
            "sibling:pri;alias:iic,indexingIndexCurrent;default:false;text-align:right;desc:number of current indexing ops"
        );
        table.addCell("pri.indexing.index_current", "default:false;text-align:right;desc:number of current indexing ops");

        table.addCell(
            "indexing.index_time",
            "sibling:pri;alias:iiti,indexingIndexTime;default:false;text-align:right;desc:time spent in indexing"
        );
        table.addCell("pri.indexing.index_time", "default:false;text-align:right;desc:time spent in indexing");

        table.addCell(
            "indexing.index_total",
            "sibling:pri;alias:iito,indexingIndexTotal;default:false;text-align:right;desc:number of indexing ops"
        );
        table.addCell("pri.indexing.index_total", "default:false;text-align:right;desc:number of indexing ops");

        table.addCell(
            "indexing.index_failed",
            "sibling:pri;alias:iif,indexingIndexFailed;default:false;text-align:right;desc:number of failed indexing ops"
        );
        table.addCell("pri.indexing.index_failed", "default:false;text-align:right;desc:number of failed indexing ops");

        table.addCell("merges.current", "sibling:pri;alias:mc,mergesCurrent;default:false;text-align:right;desc:number of current merges");
        table.addCell("pri.merges.current", "default:false;text-align:right;desc:number of current merges");

        table.addCell(
            "merges.current_docs",
            "sibling:pri;alias:mcd,mergesCurrentDocs;default:false;text-align:right;desc:number of current merging docs"
        );
        table.addCell("pri.merges.current_docs", "default:false;text-align:right;desc:number of current merging docs");

        table.addCell(
            "merges.current_size",
            "sibling:pri;alias:mcs,mergesCurrentSize;default:false;text-align:right;desc:size of current merges"
        );
        table.addCell("pri.merges.current_size", "default:false;text-align:right;desc:size of current merges");

        table.addCell("merges.total", "sibling:pri;alias:mt,mergesTotal;default:false;text-align:right;desc:number of completed merge ops");
        table.addCell("pri.merges.total", "default:false;text-align:right;desc:number of completed merge ops");

        table.addCell("merges.total_docs", "sibling:pri;alias:mtd,mergesTotalDocs;default:false;text-align:right;desc:docs merged");
        table.addCell("pri.merges.total_docs", "default:false;text-align:right;desc:docs merged");

        table.addCell("merges.total_size", "sibling:pri;alias:mts,mergesTotalSize;default:false;text-align:right;desc:size merged");
        table.addCell("pri.merges.total_size", "default:false;text-align:right;desc:size merged");

        table.addCell(
            "merges.total_time",
            "sibling:pri;alias:mtt,mergesTotalTime;default:false;text-align:right;desc:time spent in merges"
        );
        table.addCell("pri.merges.total_time", "default:false;text-align:right;desc:time spent in merges");

        table.addCell("refresh.total", "sibling:pri;alias:rto,refreshTotal;default:false;text-align:right;desc:total refreshes");
        table.addCell("pri.refresh.total", "default:false;text-align:right;desc:total refreshes");

        table.addCell("refresh.time", "sibling:pri;alias:rti,refreshTime;default:false;text-align:right;desc:time spent in refreshes");
        table.addCell("pri.refresh.time", "default:false;text-align:right;desc:time spent in refreshes");

        table.addCell(
            "refresh.external_total",
            "sibling:pri;alias:rto,refreshTotal;default:false;text-align:right;desc:total external refreshes"
        );
        table.addCell("pri.refresh.external_total", "default:false;text-align:right;desc:total external refreshes");

        table.addCell(
            "refresh.external_time",
            "sibling:pri;alias:rti,refreshTime;default:false;text-align:right;desc:time spent in external refreshes"
        );
        table.addCell("pri.refresh.external_time", "default:false;text-align:right;desc:time spent in external refreshes");

        table.addCell(
            "refresh.listeners",
            "sibling:pri;alias:rli,refreshListeners;default:false;text-align:right;desc:number of pending refresh listeners"
        );
        table.addCell("pri.refresh.listeners", "default:false;text-align:right;desc:number of pending refresh listeners");

        table.addCell(
            "search.fetch_current",
            "sibling:pri;alias:sfc,searchFetchCurrent;default:false;text-align:right;desc:current fetch phase ops"
        );
        table.addCell("pri.search.fetch_current", "default:false;text-align:right;desc:current fetch phase ops");

        table.addCell(
            "search.fetch_time",
            "sibling:pri;alias:sfti,searchFetchTime;default:false;text-align:right;desc:time spent in fetch phase"
        );
        table.addCell("pri.search.fetch_time", "default:false;text-align:right;desc:time spent in fetch phase");

        table.addCell("search.fetch_total", "sibling:pri;alias:sfto,searchFetchTotal;default:false;text-align:right;desc:total fetch ops");
        table.addCell("pri.search.fetch_total", "default:false;text-align:right;desc:total fetch ops");

        table.addCell(
            "search.open_contexts",
            "sibling:pri;alias:so,searchOpenContexts;default:false;text-align:right;desc:open search contexts"
        );
        table.addCell("pri.search.open_contexts", "default:false;text-align:right;desc:open search contexts");

        table.addCell(
            "search.query_current",
            "sibling:pri;alias:sqc,searchQueryCurrent;default:false;text-align:right;desc:current query phase ops"
        );
        table.addCell("pri.search.query_current", "default:false;text-align:right;desc:current query phase ops");

        table.addCell(
            "search.query_time",
            "sibling:pri;alias:sqti,searchQueryTime;default:false;text-align:right;desc:time spent in query phase"
        );
        table.addCell("pri.search.query_time", "default:false;text-align:right;desc:time spent in query phase");

        table.addCell(
            "search.query_total",
            "sibling:pri;alias:sqto,searchQueryTotal;default:false;text-align:right;desc:total query phase ops"
        );
        table.addCell("pri.search.query_total", "default:false;text-align:right;desc:total query phase ops");

        table.addCell(
            "search.scroll_current",
            "sibling:pri;alias:scc,searchScrollCurrent;default:false;text-align:right;desc:open scroll contexts"
        );
        table.addCell("pri.search.scroll_current", "default:false;text-align:right;desc:open scroll contexts");

        table.addCell(
            "search.scroll_time",
            "sibling:pri;alias:scti,searchScrollTime;default:false;text-align:right;desc:time scroll contexts held open"
        );
        table.addCell("pri.search.scroll_time", "default:false;text-align:right;desc:time scroll contexts held open");

        table.addCell(
            "search.scroll_total",
            "sibling:pri;alias:scto,searchScrollTotal;default:false;text-align:right;desc:completed scroll contexts"
        );
        table.addCell("pri.search.scroll_total", "default:false;text-align:right;desc:completed scroll contexts");

        table.addCell("segments.count", "sibling:pri;alias:sc,segmentsCount;default:false;text-align:right;desc:number of segments");
        table.addCell("pri.segments.count", "default:false;text-align:right;desc:number of segments");

        table.addCell("segments.memory", "sibling:pri;alias:sm,segmentsMemory;default:false;text-align:right;desc:memory used by segments");
        table.addCell("pri.segments.memory", "default:false;text-align:right;desc:memory used by segments");

        table.addCell(
            "segments.index_writer_memory",
            "sibling:pri;alias:siwm,segmentsIndexWriterMemory;default:false;text-align:right;desc:memory used by index writer"
        );
        table.addCell("pri.segments.index_writer_memory", "default:false;text-align:right;desc:memory used by index writer");

        table.addCell(
            "segments.version_map_memory",
            "sibling:pri;alias:svmm,segmentsVersionMapMemory;default:false;text-align:right;desc:memory used by version map"
        );
        table.addCell("pri.segments.version_map_memory", "default:false;text-align:right;desc:memory used by version map");

        table.addCell(
            "segments.fixed_bitset_memory",
            "sibling:pri;alias:sfbm,fixedBitsetMemory;default:false;text-align:right;desc:memory used by fixed bit sets for"
                + " nested object field types and type filters for types referred in _parent fields"
        );
        table.addCell(
            "pri.segments.fixed_bitset_memory",
            "default:false;text-align:right;desc:memory used by fixed bit sets for nested object"
                + " field types and type filters for types referred in _parent fields"
        );

        table.addCell("warmer.current", "sibling:pri;alias:wc,warmerCurrent;default:false;text-align:right;desc:current warmer ops");
        table.addCell("pri.warmer.current", "default:false;text-align:right;desc:current warmer ops");

        table.addCell("warmer.total", "sibling:pri;alias:wto,warmerTotal;default:false;text-align:right;desc:total warmer ops");
        table.addCell("pri.warmer.total", "default:false;text-align:right;desc:total warmer ops");

        table.addCell(
            "warmer.total_time",
            "sibling:pri;alias:wtt,warmerTotalTime;default:false;text-align:right;desc:time spent in warmers"
        );
        table.addCell("pri.warmer.total_time", "default:false;text-align:right;desc:time spent in warmers");

        table.addCell(
            "suggest.current",
            "sibling:pri;alias:suc,suggestCurrent;default:false;text-align:right;desc:number of current suggest ops"
        );
        table.addCell("pri.suggest.current", "default:false;text-align:right;desc:number of current suggest ops");

        table.addCell("suggest.time", "sibling:pri;alias:suti,suggestTime;default:false;text-align:right;desc:time spend in suggest");
        table.addCell("pri.suggest.time", "default:false;text-align:right;desc:time spend in suggest");

        table.addCell("suggest.total", "sibling:pri;alias:suto,suggestTotal;default:false;text-align:right;desc:number of suggest ops");
        table.addCell("pri.suggest.total", "default:false;text-align:right;desc:number of suggest ops");

        table.addCell("memory.total", "sibling:pri;alias:tm,memoryTotal;default:false;text-align:right;desc:total used memory");
        table.addCell("pri.memory.total", "default:false;text-align:right;desc:total user memory");

        table.addCell("search.throttled", "alias:sth;default:false;desc:indicates if the index is search throttled");

        table.addCell(
            "bulk.total_operations",
            "sibling:pri;alias:bto,bulkTotalOperation;default:false;text-align:right;desc:number of bulk shard ops"
        );
        table.addCell("pri.bulk.total_operations", "default:false;text-align:right;desc:number of bulk shard ops");

        table.addCell(
            "bulk.total_time",
            "sibling:pri;alias:btti,bulkTotalTime;default:false;text-align:right;desc:time spend in shard bulk"
        );
        table.addCell("pri.bulk.total_time", "default:false;text-align:right;desc:time spend in shard bulk");

        table.addCell(
            "bulk.total_size_in_bytes",
            "sibling:pri;alias:btsi,bulkTotalSizeInBytes;default:false;text-align:right;desc:total size in bytes of shard bulk"
        );
        table.addCell("pri.bulk.total_size_in_bytes", "default:false;text-align:right;desc:total size in bytes of shard bulk");

        table.addCell(
            "bulk.avg_time",
            "sibling:pri;alias:bati,bulkAvgTime;default:false;text-align:right;desc:average time spend in shard bulk"
        );
        table.addCell("pri.bulk.avg_time", "default:false;text-align:right;desc:average time spend in shard bulk");

        table.addCell(
            "bulk.avg_size_in_bytes",
            "sibling:pri;alias:basi,bulkAvgSizeInBytes;default:false;text-align:right;desc:average size in bytes of shard bulk"
        );
        table.addCell("pri.bulk.avg_size_in_bytes", "default:false;text-align:right;desc:average size in bytes of shard bulk");

        table.endHeaders();
        return table;
    }

    // package private for testing
    Table buildTable(
        final RestRequest request,
        final Map<String, Settings> indicesSettings,
        final ClusterState clusterState,
        final Map<String, IndexStats> indicesStats
    ) {
        final String healthParam = request.param("health");
        final ClusterHealthStatus healthStatusFilter = healthParam == null ? null : ClusterHealthStatus.fromString(healthParam);

        final Table table = getTableWithHeader(request);

        // Use indicesSettings to determine the indices returned - see [NOTE: WHY GET SETTINGS] above for details.
        indicesSettings.forEach((indexName, settings) -> {
            final IndexMetadata indexMetadata = clusterState.metadata().index(indexName);

            if (indexMetadata == null) {
                // The index exists in indicesSettings but its metadata is missing, which means it was created or deleted
                // concurrently with this action. However none of the requests returned an IndexNotFoundException so we do not require it to
                // exist, and therefore we can just skip it.
                return;
            }

            final IndexMetadata.State indexState = indexMetadata.getState();
            final IndexStats indexStats = indicesStats.get(indexName);
            final boolean searchThrottled = IndexSettings.INDEX_SEARCH_THROTTLED.get(settings);

            final IndexRoutingTable indexRoutingTable = clusterState.routingTable().index(indexName);
            final ClusterHealthStatus indexHealthStatus = indexRoutingTable == null
                ? ClusterHealthStatus.RED // no routing table => cluster not recovered
                : new ClusterIndexHealth(indexMetadata, indexRoutingTable).getStatus();

            if (healthStatusFilter != null && indexHealthStatus != healthStatusFilter) {
                // index health does not match the one requested
                return;
            }

            final String health;
            if (indexRoutingTable != null) {
                health = indexHealthStatus.toString().toLowerCase(Locale.ROOT);
            } else if (indexStats != null) {
                health = "red*";
            } else {
                health = "";
            }

            final CommonStats primaryStats;
            final CommonStats totalStats;
            if (indexStats == null || indexState == IndexMetadata.State.CLOSE) {
                // TODO: expose docs stats for replicated closed indices
                primaryStats = new CommonStats();
                totalStats = new CommonStats();
            } else {
                primaryStats = indexStats.getPrimaries();
                totalStats = indexStats.getTotal();
            }

            table.startRow();
            table.addCell(health);
            table.addCell(indexState.toString().toLowerCase(Locale.ROOT));
            table.addCell(indexName);
            table.addCell(indexMetadata.getIndexUUID());
            table.addCell(indexMetadata.getNumberOfShards());
            table.addCell(indexMetadata.getNumberOfReplicas());

            table.addCell(primaryStats.getDocs() == null ? null : primaryStats.getDocs().getCount());
            table.addCell(primaryStats.getDocs() == null ? null : primaryStats.getDocs().getDeleted());

            table.addCell(indexMetadata.getCreationDate());
            ZonedDateTime creationTime = ZonedDateTime.ofInstant(Instant.ofEpochMilli(indexMetadata.getCreationDate()), ZoneOffset.UTC);
            table.addCell(STRICT_DATE_TIME_FORMATTER.format(creationTime));

            table.addCell(totalStats.getStore() == null ? null : totalStats.getStore().size());
            table.addCell(primaryStats.getStore() == null ? null : primaryStats.getStore().size());

            table.addCell(totalStats.getCompletion() == null ? null : totalStats.getCompletion().getSize());
            table.addCell(primaryStats.getCompletion() == null ? null : primaryStats.getCompletion().getSize());

            table.addCell(totalStats.getFieldData() == null ? null : totalStats.getFieldData().getMemorySize());
            table.addCell(primaryStats.getFieldData() == null ? null : primaryStats.getFieldData().getMemorySize());

            table.addCell(totalStats.getFieldData() == null ? null : totalStats.getFieldData().getEvictions());
            table.addCell(primaryStats.getFieldData() == null ? null : primaryStats.getFieldData().getEvictions());

            table.addCell(totalStats.getQueryCache() == null ? null : totalStats.getQueryCache().getMemorySize());
            table.addCell(primaryStats.getQueryCache() == null ? null : primaryStats.getQueryCache().getMemorySize());

            table.addCell(totalStats.getQueryCache() == null ? null : totalStats.getQueryCache().getEvictions());
            table.addCell(primaryStats.getQueryCache() == null ? null : primaryStats.getQueryCache().getEvictions());

            table.addCell(totalStats.getRequestCache() == null ? null : totalStats.getRequestCache().getMemorySize());
            table.addCell(primaryStats.getRequestCache() == null ? null : primaryStats.getRequestCache().getMemorySize());

            table.addCell(totalStats.getRequestCache() == null ? null : totalStats.getRequestCache().getEvictions());
            table.addCell(primaryStats.getRequestCache() == null ? null : primaryStats.getRequestCache().getEvictions());

            table.addCell(totalStats.getRequestCache() == null ? null : totalStats.getRequestCache().getHitCount());
            table.addCell(primaryStats.getRequestCache() == null ? null : primaryStats.getRequestCache().getHitCount());

            table.addCell(totalStats.getRequestCache() == null ? null : totalStats.getRequestCache().getMissCount());
            table.addCell(primaryStats.getRequestCache() == null ? null : primaryStats.getRequestCache().getMissCount());

            table.addCell(totalStats.getFlush() == null ? null : totalStats.getFlush().getTotal());
            table.addCell(primaryStats.getFlush() == null ? null : primaryStats.getFlush().getTotal());

            table.addCell(totalStats.getFlush() == null ? null : totalStats.getFlush().getTotalTime());
            table.addCell(primaryStats.getFlush() == null ? null : primaryStats.getFlush().getTotalTime());

            table.addCell(totalStats.getGet() == null ? null : totalStats.getGet().current());
            table.addCell(primaryStats.getGet() == null ? null : primaryStats.getGet().current());

            table.addCell(totalStats.getGet() == null ? null : totalStats.getGet().getTime());
            table.addCell(primaryStats.getGet() == null ? null : primaryStats.getGet().getTime());

            table.addCell(totalStats.getGet() == null ? null : totalStats.getGet().getCount());
            table.addCell(primaryStats.getGet() == null ? null : primaryStats.getGet().getCount());

            table.addCell(totalStats.getGet() == null ? null : totalStats.getGet().getExistsTime());
            table.addCell(primaryStats.getGet() == null ? null : primaryStats.getGet().getExistsTime());

            table.addCell(totalStats.getGet() == null ? null : totalStats.getGet().getExistsCount());
            table.addCell(primaryStats.getGet() == null ? null : primaryStats.getGet().getExistsCount());

            table.addCell(totalStats.getGet() == null ? null : totalStats.getGet().getMissingTime());
            table.addCell(primaryStats.getGet() == null ? null : primaryStats.getGet().getMissingTime());

            table.addCell(totalStats.getGet() == null ? null : totalStats.getGet().getMissingCount());
            table.addCell(primaryStats.getGet() == null ? null : primaryStats.getGet().getMissingCount());

            table.addCell(totalStats.getIndexing() == null ? null : totalStats.getIndexing().getTotal().getDeleteCurrent());
            table.addCell(primaryStats.getIndexing() == null ? null : primaryStats.getIndexing().getTotal().getDeleteCurrent());

            table.addCell(totalStats.getIndexing() == null ? null : totalStats.getIndexing().getTotal().getDeleteTime());
            table.addCell(primaryStats.getIndexing() == null ? null : primaryStats.getIndexing().getTotal().getDeleteTime());

            table.addCell(totalStats.getIndexing() == null ? null : totalStats.getIndexing().getTotal().getDeleteCount());
            table.addCell(primaryStats.getIndexing() == null ? null : primaryStats.getIndexing().getTotal().getDeleteCount());

            table.addCell(totalStats.getIndexing() == null ? null : totalStats.getIndexing().getTotal().getIndexCurrent());
            table.addCell(primaryStats.getIndexing() == null ? null : primaryStats.getIndexing().getTotal().getIndexCurrent());

            table.addCell(totalStats.getIndexing() == null ? null : totalStats.getIndexing().getTotal().getIndexTime());
            table.addCell(primaryStats.getIndexing() == null ? null : primaryStats.getIndexing().getTotal().getIndexTime());

            table.addCell(totalStats.getIndexing() == null ? null : totalStats.getIndexing().getTotal().getIndexCount());
            table.addCell(primaryStats.getIndexing() == null ? null : primaryStats.getIndexing().getTotal().getIndexCount());

            table.addCell(totalStats.getIndexing() == null ? null : totalStats.getIndexing().getTotal().getIndexFailedCount());
            table.addCell(primaryStats.getIndexing() == null ? null : primaryStats.getIndexing().getTotal().getIndexFailedCount());

            table.addCell(totalStats.getMerge() == null ? null : totalStats.getMerge().getCurrent());
            table.addCell(primaryStats.getMerge() == null ? null : primaryStats.getMerge().getCurrent());

            table.addCell(totalStats.getMerge() == null ? null : totalStats.getMerge().getCurrentNumDocs());
            table.addCell(primaryStats.getMerge() == null ? null : primaryStats.getMerge().getCurrentNumDocs());

            table.addCell(totalStats.getMerge() == null ? null : totalStats.getMerge().getCurrentSize());
            table.addCell(primaryStats.getMerge() == null ? null : primaryStats.getMerge().getCurrentSize());

            table.addCell(totalStats.getMerge() == null ? null : totalStats.getMerge().getTotal());
            table.addCell(primaryStats.getMerge() == null ? null : primaryStats.getMerge().getTotal());

            table.addCell(totalStats.getMerge() == null ? null : totalStats.getMerge().getTotalNumDocs());
            table.addCell(primaryStats.getMerge() == null ? null : primaryStats.getMerge().getTotalNumDocs());

            table.addCell(totalStats.getMerge() == null ? null : totalStats.getMerge().getTotalSize());
            table.addCell(primaryStats.getMerge() == null ? null : primaryStats.getMerge().getTotalSize());

            table.addCell(totalStats.getMerge() == null ? null : totalStats.getMerge().getTotalTime());
            table.addCell(primaryStats.getMerge() == null ? null : primaryStats.getMerge().getTotalTime());

            table.addCell(totalStats.getRefresh() == null ? null : totalStats.getRefresh().getTotal());
            table.addCell(primaryStats.getRefresh() == null ? null : primaryStats.getRefresh().getTotal());

            table.addCell(totalStats.getRefresh() == null ? null : totalStats.getRefresh().getTotalTime());
            table.addCell(primaryStats.getRefresh() == null ? null : primaryStats.getRefresh().getTotalTime());

            table.addCell(totalStats.getRefresh() == null ? null : totalStats.getRefresh().getExternalTotal());
            table.addCell(primaryStats.getRefresh() == null ? null : primaryStats.getRefresh().getExternalTotal());

            table.addCell(totalStats.getRefresh() == null ? null : totalStats.getRefresh().getExternalTotalTime());
            table.addCell(primaryStats.getRefresh() == null ? null : primaryStats.getRefresh().getExternalTotalTime());

            table.addCell(totalStats.getRefresh() == null ? null : totalStats.getRefresh().getListeners());
            table.addCell(primaryStats.getRefresh() == null ? null : primaryStats.getRefresh().getListeners());

            table.addCell(totalStats.getSearch() == null ? null : totalStats.getSearch().getTotal().getFetchCurrent());
            table.addCell(primaryStats.getSearch() == null ? null : primaryStats.getSearch().getTotal().getFetchCurrent());

            table.addCell(totalStats.getSearch() == null ? null : totalStats.getSearch().getTotal().getFetchTime());
            table.addCell(primaryStats.getSearch() == null ? null : primaryStats.getSearch().getTotal().getFetchTime());

            table.addCell(totalStats.getSearch() == null ? null : totalStats.getSearch().getTotal().getFetchCount());
            table.addCell(primaryStats.getSearch() == null ? null : primaryStats.getSearch().getTotal().getFetchCount());

            table.addCell(totalStats.getSearch() == null ? null : totalStats.getSearch().getOpenContexts());
            table.addCell(primaryStats.getSearch() == null ? null : primaryStats.getSearch().getOpenContexts());

            table.addCell(totalStats.getSearch() == null ? null : totalStats.getSearch().getTotal().getQueryCurrent());
            table.addCell(primaryStats.getSearch() == null ? null : primaryStats.getSearch().getTotal().getQueryCurrent());

            table.addCell(totalStats.getSearch() == null ? null : totalStats.getSearch().getTotal().getQueryTime());
            table.addCell(primaryStats.getSearch() == null ? null : primaryStats.getSearch().getTotal().getQueryTime());

            table.addCell(totalStats.getSearch() == null ? null : totalStats.getSearch().getTotal().getQueryCount());
            table.addCell(primaryStats.getSearch() == null ? null : primaryStats.getSearch().getTotal().getQueryCount());

            table.addCell(totalStats.getSearch() == null ? null : totalStats.getSearch().getTotal().getScrollCurrent());
            table.addCell(primaryStats.getSearch() == null ? null : primaryStats.getSearch().getTotal().getScrollCurrent());

            table.addCell(totalStats.getSearch() == null ? null : totalStats.getSearch().getTotal().getScrollTime());
            table.addCell(primaryStats.getSearch() == null ? null : primaryStats.getSearch().getTotal().getScrollTime());

            table.addCell(totalStats.getSearch() == null ? null : totalStats.getSearch().getTotal().getScrollCount());
            table.addCell(primaryStats.getSearch() == null ? null : primaryStats.getSearch().getTotal().getScrollCount());

            table.addCell(totalStats.getSegments() == null ? null : totalStats.getSegments().getCount());
            table.addCell(primaryStats.getSegments() == null ? null : primaryStats.getSegments().getCount());

            table.addCell(totalStats.getSegments() == null ? null : ByteSizeValue.ZERO);
            table.addCell(primaryStats.getSegments() == null ? null : ByteSizeValue.ZERO);

            table.addCell(totalStats.getSegments() == null ? null : totalStats.getSegments().getIndexWriterMemory());
            table.addCell(primaryStats.getSegments() == null ? null : primaryStats.getSegments().getIndexWriterMemory());

            table.addCell(totalStats.getSegments() == null ? null : totalStats.getSegments().getVersionMapMemory());
            table.addCell(primaryStats.getSegments() == null ? null : primaryStats.getSegments().getVersionMapMemory());

            table.addCell(totalStats.getSegments() == null ? null : totalStats.getSegments().getBitsetMemory());
            table.addCell(primaryStats.getSegments() == null ? null : primaryStats.getSegments().getBitsetMemory());

            table.addCell(totalStats.getWarmer() == null ? null : totalStats.getWarmer().current());
            table.addCell(primaryStats.getWarmer() == null ? null : primaryStats.getWarmer().current());

            table.addCell(totalStats.getWarmer() == null ? null : totalStats.getWarmer().total());
            table.addCell(primaryStats.getWarmer() == null ? null : primaryStats.getWarmer().total());

            table.addCell(totalStats.getWarmer() == null ? null : totalStats.getWarmer().totalTime());
            table.addCell(primaryStats.getWarmer() == null ? null : primaryStats.getWarmer().totalTime());

            table.addCell(totalStats.getSearch() == null ? null : totalStats.getSearch().getTotal().getSuggestCurrent());
            table.addCell(primaryStats.getSearch() == null ? null : primaryStats.getSearch().getTotal().getSuggestCurrent());

            table.addCell(totalStats.getSearch() == null ? null : totalStats.getSearch().getTotal().getSuggestTime());
            table.addCell(primaryStats.getSearch() == null ? null : primaryStats.getSearch().getTotal().getSuggestTime());

            table.addCell(totalStats.getSearch() == null ? null : totalStats.getSearch().getTotal().getSuggestCount());
            table.addCell(primaryStats.getSearch() == null ? null : primaryStats.getSearch().getTotal().getSuggestCount());

            table.addCell(totalStats.getTotalMemory());
            table.addCell(primaryStats.getTotalMemory());

            table.addCell(searchThrottled);

            table.addCell(totalStats.getBulk() == null ? null : totalStats.getBulk().getTotalOperations());
            table.addCell(primaryStats.getBulk() == null ? null : primaryStats.getBulk().getTotalOperations());

            table.addCell(totalStats.getBulk() == null ? null : totalStats.getBulk().getTotalTime());
            table.addCell(primaryStats.getBulk() == null ? null : primaryStats.getBulk().getTotalTime());

            table.addCell(totalStats.getBulk() == null ? null : totalStats.getBulk().getTotalSizeInBytes());
            table.addCell(primaryStats.getBulk() == null ? null : primaryStats.getBulk().getTotalSizeInBytes());

            table.addCell(totalStats.getBulk() == null ? null : totalStats.getBulk().getAvgTime());
            table.addCell(primaryStats.getBulk() == null ? null : primaryStats.getBulk().getAvgTime());

            table.addCell(totalStats.getBulk() == null ? null : totalStats.getBulk().getAvgSizeInBytes());
            table.addCell(primaryStats.getBulk() == null ? null : primaryStats.getBulk().getAvgSizeInBytes());

            table.endRow();
        });

        return table;
    }
}
