title: How to add a new node to my Elasticsearch cluster
body: <p>My cluster has a <code>yellow</code> health as it has only one single node, so the replicas remain unasigned simply because no other node is available to contain them.</p>
  
  <p><strong>So I want to create/add another node so Elasticsearch can begin allocating replica’s to it. I've only <em>one machine</em> and I'm <em>running ES as a service</em>.</strong></p>
  
  <p>I've found tons of site with some info but none of them is giving me <em>clearly</em> how can I add another node to ES.</p>
  
  <p>Can someone explain me which files do I've to edit and what commands do I've to launch in order to create another node in my cluster? Do I've to run two ES instance? How can I do this?</p>
  
  <p>Thanks in advance.</p>