title: How to chose the number of shards and replicas Elasticsearch
body: <p>Could someone please tell me how can I chose the number of shards and replica for Elasticsearch index ?</p>
  <p>I have configured the size of the index to 20GB but didn't know how I can I chose the number or shards and replica</p>
  <p>NB: I have <strong>5 nodes</strong>, <strong>3 Master nodes</strong> (for <strong>hot</strong> Data), and <strong>2 Data nodes</strong> ( One for <strong>warm</strong> and the seconde for <strong>cold</strong> data)</p>
  <p>Thanks for your help</p>