title: elasticsearch: Steps to add replica?
body: <p>We have a single ES server, in production.</p>
  
  <p>We would now like to add a replica, in another DC, as a warm/hot spare fail over.</p>
  
  <p>I know how to do this on mongo, redis, etc, but cannot seem to find the docs on how to do it to ES. (ES docs seem to assume the systems are all on same subnet, etc)</p>