Graylog 4.2, ES Cluster, with 3 Master only nodes

[gsmith]

Hello && welcome

I’m not understanding the issue, if you can explain it in great detail.
What I see from your statement is you have 3 Elasticsearch nodes?

What kind of test did you execute to make sure the configuration is correct?
Do you only have one Graylog server with MongDb?

To help you further please take a look here. This will help us, help you since we can not see your environment. Or how its configured.

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Thanks