Yes. It’s safe.
You can do it one at a time.

If you already have data around and don’t want your shards moving during this, 
you should disable allocation.


-- 
David Pilato | Technical Advocate | Elasticsearch.com
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> Le 18 févr. 2015 à 16:14, Jan-Erik Westlund <je.westl...@gmail.com> a écrit :
> 
> Hi !
> 
> Is it safe to change the node names of my 3 nodes in an existing 
> elasticsearch 1.4.0 cluster ?
> 
> The reason is to get rid of the random names like: Elizabeth "Betsy" 
> Braddock, Franz Kafka, etc...
> 
> Is it just to set the node.name: "server name" in elasticsearch.yml and then 
> restart the daemon ? 
> Do I do it one node at the time, or do I need down the cluster and then 
> change all node names, and then bring up the cluster again ?
> 
> 
> //Jan-Erik
> 
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