title: How to know the curator version?
body: <p>I am using Elasticsearch version 2.1.0. How can I know the version of Curator being used ?
  While changing the settings (number of replicas) I am getting an exception as:</p>
  
  <pre><code>{
     "error": {
        "root_cause": [
           {
  "type": "illegal_argument_exception",
  "reason":Can't update [index.number_of_replicas] on closed indices [[.marvel-es-2016.12.12] - can leave index in an unopenable state"
  "status": 400
  }
  </code></pre>
  
  <p>Any clues ?</p>