title: How to recover data from a renamed Elasticsearch cluster?
body: <p>I have just spent the best part of 12 hours indexing 70 million documents into Elasticsearch (1.4) on a single node, single server setup on an EC2 Ubuntu 14.04 box.  This completed successfully however before taking a snapshot of my server I thought it would be wise to rename the cluster to prevent it accidentally joining production boxes in the future, what a mistake that was!  After renaming in the elasticsearch.yml file and restarting the ES service my indexes have disappeared.</p>
  
  <p>I saw the data was still present in the data dir under the old cluster name, i tried stopping ES, moving the data manually in the filesystem and then starting the ES service again but still no luck.  I then tried renaming back to the old cluster name, putting everything back in place and still nothing.  The data is still there, all 44gb of it but I have no idea how to get this back.  I have spent the past 2 hours searching and all i can seem to find is advice on how to restore from a snapshot which I don't have.  Any advice would be hugely appreciated - I really hope I haven't lost a day's work.  I will never rename a cluster again!</p>
  
  <p>Thanks in advance.</p>