title: Elastic Search mapper_parsing_exception error
body: <p>I have created a index in elastic search with name test. Index mapping is as follow:</p>
  
  <pre><code>{
      "title": {
          "type": "text",
          "fields": {
              "raw": {
                  "type": "keyword"
              }
          }
      },
      "url": {
          "type": "text",
          "fields": {
              "raw": {
                  "type": "keyword"
              }
          }
      }
  }
  </code></pre>
  
  <p>after creating index I have added following documents into it:</p>
  
  <pre><code> {
      "title": "demo",
      "url": {
          "name": "tiger",
          "age": 10
      }
  }
  </code></pre>
  
  <p>But I am getting following error: </p>
  
  <blockquote>
    <p>{"mapper_parsing_exception","reason":"failed to parse field [url] of
    type [text]"}</p>
  </blockquote>
  
  <p>can anyone help me into this?</p>