title: No mapping found for field in order to sort on in ElasticSearch
body: <p>Elasticsearch throws a <code>SearchParseException</code> while parsing query if there are some documents found not containing field used in sort criteria.</p>
  
  <blockquote>
    <p>SearchParseException: Parse Failure [No mapping found for [price] in order to sort on]</p>
  </blockquote>
  
  <p>How can I successfully search these documents, even if some are missing the <code>price</code> field?</p>