title: Returning the timestamp field in elasticsearch
body: <p>Why can I not see the _timestamp field while being able to filter a query by it?</p>
  
  <p>The following query return the correct documents, but not the timestamp itself. How can I return the timestamp?</p>
  
  <pre><code>{
    "fields": [
      "_timestamp",
      "_source"
    ],
    "query": {
      "filtered": {
        "query": {
          "match_all": {}
        },
        "filter": {
          "range": {
            "_timestamp": {
              "from": "2013-01-01"
            }
          }
        }
      }
    }
  }
  </code></pre>
  
  <p>The mapping is:</p>
  
  <pre><code>{
      "my_doctype": {
          "_timestamp": {
              "enabled": "true"
          },
          "properties": {
              "cards": {
                  "type": "integer"
              }
          }
      }
  }
  </code></pre>
  
  <p>sample output:</p>
  
  <pre><code>{
    "took" : 1,
    "timed_out" : false,
    "_shards" : {
      "total" : 1,
      "successful" : 1,
      "failed" : 0
    },
    "hits" : {
      "total" : 2,
      "max_score" : 1.0,
      "hits" : [ {
        "_index" : "test1",
        "_type" : "doctype1",
        "_id" : "HjfryYQEQL6RkEX3VOiBHQ",
        "_score" : 1.0, "_source" : {"cards": "5"}
      }, {
        "_index" : "test1",
        "_type" : "doctype1",
        "_id" : "sDyHcT1BTMatjmUS0NSoEg",
        "_score" : 1.0, "_source" : {"cards": "2"}
      }]
    }
  </code></pre>