title: ElasticSearch search by datetime field
body: <p>I need to do a search through multiple fields including a datetime field. </p>
  
  <p>The search query may or may not contain date values specified in different formats:</p>
  
  <ul>
  <li>April 4</li>
  <li>04/04/2013</li>
  <li>2013-04-04</li>
  </ul>
  
  <p>Query sting might contain some term that cannot be converted to date time.</p>
  
  <p>Is there any way I can support that types of query using elastic search?</p>