title: How to remove master node from elasticsearch cluster on runtime without down time
body: <p>I have an elastic search cluster with 5 master nodes. I want to remove 3 master nodes. How can I do that.  </p>
  
  <p>I would like to make changes to the config file as well.</p>
  
  <p>Please let me know the step by step procedure.</p>
  
  <p>Any leads would be highly appreciated.</p>