title: ElasticSearch - How to make a 1-to-1 copy of an existing index
body: <p>I'm using Elasticsearch 2.3.3 and trying to make an exact copy of an existing index. (using the reindex plugin bundled with Elasticsearch installation)</p>
  
  <p>The problem is that the data is copied but settings such as the mapping and the analyzer are left out.</p>
  
  <p>What is the best way to make an exact copy of an existing index, including all of its settings?</p>
  
  <p>My main goal is to create a copy, change the copy and only if all went well switch an alias to the copy. (Zero downtime backup and restore)</p>