title: Elasticsearch - ignore fields from indexing document
body: <p>I have simple question. I'm indexing JSON files that contains several fields into Elasticsearch. How to say ElasticSearch to <strong>ignore</strong> (don't index and store them at all) group of defined fields from the incoming file OR to work only with defined group of fields? Is this possible by using the mapping? </p>
  
  <p>For example: I have JSON files like this:</p>
  
  <pre><code>{
      "id": 123456789,
      "name": "Name value",
      "screenName": "Nick name",
      "location": "Location value",
      "description": "Description text",
      "url": "url value",
      "anotherField": 456789,
      "status": null,
      "anotherField2": "9AE4E8",
      "color": "333333",
      .......
  }
  </code></pre>
  
  <p>And now I want to Elasticsearch works only with fields (for example) "id;name;description;location;status;url" and ingnore other fields.</p>
  
  <p>Any help? Thanks.</p>