title: ElasticSearch cannot find an exact value that exists in a string field
body: <p>When I do an empty query to list some results, I see the values are there. Ex:</p>
  
  <pre><code>{
      "took": 6,
      "timed_out": false,
      "_shards": {
          "total": 5,
          "successful": 5,
          "failed": 0
      },
      "hits": {
          "total": 3024,
          "max_score": 1.0,
          "hits": [{
              "_index": "geotiff_test",
              "_type": "geometa",
              "_id": "AVtt5-j6uVuoyTMhX204",
              "_score": 1.0,
              "_source": {
                  "thumbnail": "thumbnail1029.png"
              }
          }, {
              "_index": "geotiff_test",
              "_type": "geometa",
              "_id": "AVtt5-mTuVuoyTMhX205",
              "_score": 1.0,
              "_source": {
                  "thumbnail": "thumbnail1321.png"
              }
          }, {
              "_index": "geotiff_test",
              "_type": "geometa",
              "_id": "AVtt5-xkuVuoyTMhX209",
              "_score": 1.0,
              "_source": {
                  "thumbnail": "thumbnail2567.png"
              }
          }, {
              "_index": "geotiff_test",
              "_type": "geometa",
              "_id": "AVtt5zr8uVuoyTMhX20F",
              "_score": 1.0,
              "_source": {
                  "thumbnail": "thumbnail2122.png"
              }
          }, {
              "_index": "geotiff_test",
              "_type": "geometa",
              "_id": "AVtt5z23uVuoyTMhX20L",
              "_score": 1.0,
              "_source": {
                  "thumbnail": "thumbnail1823.png"
              }
          }, {
              "_index": "geotiff_test",
              "_type": "geometa",
              "_id": "AVtt5-53uVuoyTMhX21A",
              "_score": 1.0,
              "_source": {
                  "thumbnail": "thumbnail1616.png"
              }
          }, {
              "_index": "geotiff_test",
              "_type": "geometa",
              "_id": "AVtt5_AXuVuoyTMhX21C",
              "_score": 1.0,
              "_source": {
                  "thumbnail": "thumbnail3002.png"
              }
          }, {
              "_index": "geotiff_test",
              "_type": "geometa",
              "_id": "AVtt5_j3uVuoyTMhX21U",
              "_score": 1.0,
              "_source": {
                  "thumbnail": "thumbnail3039.png"
              }
          }, {
              "_index": "geotiff_test",
              "_type": "geometa",
              "_id": "AVtt5_yQuVuoyTMhX21d",
              "_score": 1.0,
              "_source": {
                  "thumbnail": "thumbnail1136.png"
              }
          }, {
              "_index": "geotiff_test",
              "_type": "geometa",
              "_id": "AVtt5zbquVuoyTMhX20C",
              "_score": 1.0,
              "_source": {
                  "thumbnail": "thumbnail166.png"
              }
          }, {
              "_index": "geotiff_test",
              "_type": "geometa",
              "_id": "AVtt5zfsuVuoyTMhX20E",
              "_score": 1.0,
              "_source": {
                  "thumbnail": "thumbnail2767.png"
              }
          }, {
              "_index": "geotiff_test",
              "_type": "geometa",
              "_id": "AVtt59jQuVuoyTMhX20p",
              "_score": 1.0,
              "_source": {
                  "thumbnail": "thumbnail2852.png"
              }
          }, {
              "_index": "geotiff_test",
              "_type": "geometa",
              "_id": "AVtt5_PpuVuoyTMhX21J",
              "_score": 1.0,
              "_source": {
                  "thumbnail": "thumbnail1392.png"
              }
          }, {
              "_index": "geotiff_test",
              "_type": "geometa",
              "_id": "AVtt58YguVuoyTMhX20N",
              "_score": 1.0,
              "_source": {
                  "thumbnail": "thumbnail603.png"
              }
          }, {
              "_index": "geotiff_test",
              "_type": "geometa",
              "_id": "AVtt5_38uVuoyTMhX21h",
              "_score": 1.0,
              "_source": {
                  "thumbnail": "thumbnail416.png"
              }
          }, {
              "_index": "geotiff_test",
              "_type": "geometa",
              "_id": "AVtt5-JFuVuoyTMhX20y",
              "_score": 1.0,
              "_source": {
                  "thumbnail": "thumbnail896.png"
              }
          }, {
              "_index": "geotiff_test",
              "_type": "geometa",
              "_id": "AVtt6B1NuVuoyTMhX22i",
              "_score": 1.0,
              "_source": {
                  "thumbnail": "thumbnail846.png"
              }
          }, {
              "_index": "geotiff_test",
              "_type": "geometa",
              "_id": "AVtt6B3vuVuoyTMhX22k",
              "_score": 1.0,
              "_source": {
                  "thumbnail": "thumbnail1214.png"
              }
          }, {
              "_index": "geotiff_test",
              "_type": "geometa",
              "_id": "AVtt6B90uVuoyTMhX22o",
              "_score": 1.0,
              "_source": {
                  "thumbnail": "thumbnail1536.png"
              }
          }, {
              "_index": "geotiff_test",
              "_type": "geometa",
              "_id": "AVtt6COkuVuoyTMhX22y",
              "_score": 1.0,
              "_source": {
                  "thumbnail": "thumbnail246.png"
              }
          }]
      }
  }
  </code></pre>
  
  <p>Yet when I run a query like this, it returns nothing:</p>
  
  <pre><code>curl -X POST http://localhost:9200/geotiff_test/geometa/_search -d '{
      "query": {
          "term": {
              "thumbnail": "thumbnail1536.png"
          }
      }
  }'
  </code></pre>
  
  <p>This is the result:</p>
  
  <pre><code>{
      "took": 1,
      "timed_out": false,
      "_shards": {
          "total": 5,
          "successful": 5,
          "failed": 0
      },
      "hits": {
          "total": 0,
          "max_score": null,
          "hits": []
      }
  }
  </code></pre>
  
  <p>If this were Solr, all I want to do is run this simple query: <code>thumbnail:"thumbnail1536.png"</code></p>
  
  <p>Can someone tell me what is going wrong here?</p>