We have cluster of 4 nodes, where 2 nodes are master and data and other 2 nodes are data nodes, the configuration was working fine since 2 yrs, today we have to restart the cluster and since then we are getting master not discovered exception

Elastic Stack Elasticsearch
3

Hello,

You had a similar issue a couple of days ago where it was suggest to remove the data nodes from the discovery.seed_hosts settings and also use the default value for the allocation settings, it was this issue.

But it seems that you didn't change anything.

Also, you are using non-default ports, if I'm not wrong you need to specify that in the discovery.seed_hosts.

Your discovery.seed_hosts needs to look like this in both of your masters, change it and try to restart them again.

discovery.seed_hosts: ["ES-Master-1:9840", "ES-Master-2:9840"]
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