Is it possible to remove node from ES 6.8?

Elastic Stack Elasticsearch
1

Hello

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?

2

If your data is at all important, running replicas is the bare minimum step you should be doing.

To remove a node you will want to;

  1. Exclude it from allocation - https://www.elastic.co/guide/en/elasticsearch/reference/7.9/shard-allocation-filtering.html
  2. Wait for that to complete
  3. Stop the Elasticsearch process on the node
  4. Done.
3

I do know about replicas, but until now I was able to run only two nodes, both loaded enough without replicas. The main purpose of the third node was need for replicas.
I'll try excluding right now.

4

Tried, nothing meaningful happened, I've ended up stopping cluster, backup and recover. Current index was (and is) clogged anyway and I don't understand yet what to do with it.

5

It not clear what you tried and what did or didn't happen. I don't know what a clogged index is either, there is no such concept in Elasticsearch/

6

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