I've set up a server, started a ES 6.8 instance, run it for a while in cluster and found an error in disk setup requiring me to reinstall everything starting from OS.
As far as I can understand, I have only one or two options - backup everything and reinstall or somehow remove node from cluster, wait for all shards to move to active nodes, remove ES data and than backup/restore much less data.
First option will result in a long downtime of a node; the second should take more time overall, but no downtime and less mine time.
Is it possible to safely remove a node from cluster? Or should I first add a replica to every shard, or is it impossible at all?