title: searching for a word in a string indexed field in elasticsearch java
body: <p>I have a String field <strong>countries</strong> of format eg <strong>"SS,SX,US,IND,CND,TN"</strong> and I have a input String field <strong>countryCode</strong> which will be of form <strong>"SS"</strong>. How can I query all the records where a given countryCode is in countries in elasticsearch? I have tried with <code>match</code> and <code>match_phrase</code> queries but didn't get the desired results.</p>
  
  <p><em>Query.must(QueryBuilders.matchPhraseQuery("countries", countryCode))</em></p>