Cluster.initial_master_nodes Settings

Elastic Stack Elasticsearch
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Hi guys

I have three node cluster using Elastic 8.6. It is in operation for more than a year. We are going to upgrade to 8.8 soon. I this regard I have a question on cluster.initial_master_nodes setting. This setting is still enabled. But as per this document Bootstrapping a cluster | Elasticsearch Guide [8.8] | Elastic , it appears we should comment this setting as this is only one-off requirement.

Should this (cluster.initial_master_nodes) be removed or commented in elasticsearch.yml ?

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Yes removed or commented it out.

In the documentation you reference, there is a large warning why you should remove it complete with explanation of the risk if you do not.

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Greate Appreciated, Thanks Stephen. Actually, that big warning alerted me. Would it be prudent to comment this specific setting in all nodes and do a rolling start? Data node first and master node last. Obviously, start nodes when cluster health is Green.

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