Migrating indices after adding warm and cold nodes to an existing cluster

Elastic Stack Elasticsearch
1

Hi all,

following situation : we have an existing 7.12 ES cluster in Elastic Cloud, with 2 hot data nodes. Multiple indices exist which were following an hot-warm-cold ILM policy and are already in a hot, warm or cold phase, but there are no warm and cold ES nodes present yet.

What happens when warm and cold nodes are added to the Elastic Cloud setup ?
Will the existing warm and cold indices be rerouted automatically ?
Or does this rerouting need to be triggered ?

Kind regards, Ben

2

The cluster should detect these and move indices accordingly. You can definitely trigger a reroute if needed though.

The one question I would ask is; Are all your indices currently only allocated to the hot tier?

3

yes, all indices, in phase hot, warm or cold, are all in the hot tier.

4

Ok, well it might be worth reviewing your config before you add your extra nodes, just to make sure everything it ok.

5

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