title: Elasticsearch cluster with two nodes only
body: <p>I have a two-node scale ES cluster. In the configuration of the ES, I set the <code>discovery.zen.minimum_master_nodes</code> to <strong>2</strong>, and all the other settings are left to default (both nodes are master node, both nodes are data node, and both nodes are ingest).</p>
  
  <p>In most of the blogs, I see that people come up with at least a three-node-cluster.<br>
  I have two question basically: </p>
  
  <ol>
  <li>Do I need to worry about the split-brain issue with my two-node
  cluster?</li>
  <li>How to configure the node related roles (master, data, ingest), when
  you have two nodes only?</li>
  </ol>