title: Elastic search cluster.name property
body: <p>There is a file named "elasticsearch.yml". I have following questions about the file:- </p>
  
  <ul>
  <li>Is it mandatory to name the file as elastic-search? </li>
  <li>There is a property named cluster.name in the file, what is the use? If we don't mention any name, will it use any default name? </li>
  <li>I am confused because i removed the name from the YML file but the program still worked.</li>
  </ul>