title: ElasticSearch _Source is always empty on the return
body: <p>I am posting a query to <code>http://localhost:9200/movie_db/movie/_search</code> but _source attribute is always empty on the return resposne. I made it enabled but that doesn't help.</p>
  
  <p>Movie DB:</p>
  
  <pre><code>TRY DELETE /movie_db
  PUT /movie_db {"mappings": {"movie": {"properties": {"title": {"type": "string", "analyzer": "snowball"}, "actors": {"type": "string", "position_offset_gap" : 100, "analyzer": "standard"}, "genre": {"type": "string", "index": "not_analyzed"}, "release_year": {"type": "integer", "index": "not_analyzed"}, "description": {"_source": true, "type": "string", "analyzer": "snowball"}}}}}
  BULK INDEX movie_db/movie
  {"_id": 1, "title": "Hackers", "release_year": 1995, "genre": ["Action", "Crime", "Drama"], "actors": ["Johnny Lee Miller", "Angelina Jolie"], "description": "High-school age computer expert Zero Cool and his hacker friends take on an evil corporation's computer virus with their hacking skills."}
  {"_id": 2, "title": "Johnny Mnemonic", "release": 1995, "genre": ["Science Fiction", "Action"], "actors": ["Keanu Reeves", "Dolph Lundgren"], "description": "A guy with a chip in his head shouts incomprehensibly about room service in this dystopian vision of our future."}
  {"_id": 3, "title": "Swordfish", "release_year": 2001, "genre": ["Action", "Crime"], "actors": ["John Travolta", "Hugh Jackman", "Halle Berry"], "description": "A cast of characters challenge society's commonly held view that computer experts are not the beautiful people. Somehow, the CIA is hacked in under 5 minutes."}
  {"_id": 4, "title": "Tomb Raider", "release_year": 2001, "genre": ["Adventure", "Action", "Fantasy"], "actors": ["Angelina Jolie", "Jon Voigt"], "description": "The story of a girl and her quest for antiquities in the face of adversity. This epic is adapter from its traditional video-game format to the big screen"}
  </code></pre>
  
  <p>Query:</p>
  
  <pre><code>{
      "query" : 
      {
          "term" : { "genre" : "Crime" }
      },
  }
  </code></pre>
  
  <p>Results:</p>
  
  <pre><code>{
      "took": 4,
      "timed_out": false,
      "_shards": {
          "total": 5,
          "successful": 5,
          "failed": 0
      },
      "hits": {
          "total": 2,
          "max_score": 0.30685282,
          "hits": [
              {
                  "_index": "movie_db",
                  "_type": "movie",
                  "_id": "3",
                  "_score": 0.30685282,
                  "_source": {}
              },
              {
                  "_index": "movie_db",
                  "_type": "movie",
                  "_id": "1",
                  "_score": 0.30685282,
                  "_source": {}
              }
          ]
      }
  }
  </code></pre>