title: Elasticsearch - Do searches for alternative country codes
body: <p>I have a document with a field called 'countryCode'. I have a term query that search for the keyword value of it. But having some issues with:</p>
  
  <ul>
  <li>Some records saying UK and some other saying GB</li>
  <li>Some records saying US and some other USA</li>
  <li>And the list goes on..</li>
  </ul>
  
  <p>Can I instruct my index to handle all those variations somehow, instead of me having to expand the terms on my query filter?</p>