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ElasticSearch - setting [cluster.initial_master_nodes] is not allowed when [discovery.type] is set to [single-node]

Upgrading ElasticSearch can be quite challenging(at least for me it was). I talked about some other issues I had while upgrading before. Let's add a last one to the list...

When talking about the bootstrap check failures in a previous post, I shared my final solution.

But if you were paying attention as a reader you maybe noticed that I didn’t follow the suggestions mentioned inside the bootstrap check error:

bootstrap check failure [1] of [2]: the default discovery settings are unsuitable for production use; at least one of [discovery.seed_hosts, discovery.seed_providers, cluster.initial_master_nodes] must be configured

I didn’t set the discovery.seed_hosts, discovery.seed_providers or cluster.initial_master_nodes setting as mentioned, instead I changed the discovery.type to single-node.

In fact my first attempt looked like this:

However this resulted in the following error message:

[2022-05-09T11:33:18,943][WARN ][stderr                   ] [SERVER1] java.lang.IllegalArgumentException: setting [cluster.initial_master_nodes] is not allowed when [discovery.type] is set to [single-node]

[2022-05-09T11:33:18,943][WARN ][stderr                   ] [SERVER1] at org.elasticsearch.cluster.coordination.ClusterBootstrapService.<init>(ClusterBootstrapService.java:87)

[2022-05-09T11:33:18,944][WARN ][stderr                   ] [SERVER1] at org.elasticsearch.cluster.coordination.Coordinator.<init>(Coordinator.java:258)

[2022-05-09T11:33:18,944][WARN ][stderr                   ] [SERVER1] at org.elasticsearch.discovery.DiscoveryModule.<init>(DiscoveryModule.java:191)

[2022-05-09T11:33:18,944][WARN ][stderr                   ] [SERVER1] at org.elasticsearch.node.Node.<init>(Node.java:828)

[2022-05-09T11:33:18,944][WARN ][stderr                   ] [SERVER1] at org.elasticsearch.node.Node.<init>(Node.java:291)

[2022-05-09T11:33:18,944][WARN ][stderr                   ] [SERVER1] at org.elasticsearch.bootstrap.Bootstrap$5.<init>(Bootstrap.java:234)

[2022-05-09T11:33:18,944][WARN ][stderr                   ] [SERVER1] at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:234)

[2022-05-09T11:33:18,944][WARN ][stderr                   ] [SERVER1] at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:358)

[2022-05-09T11:33:18,944][WARN ][stderr                   ] [SERVER1] at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:166)

[2022-05-09T11:33:18,945][WARN ][stderr                   ] [SERVER1] at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:157)

[2022-05-09T11:33:18,945][WARN ][stderr                   ] [SERVER1] at org.elasticsearch.common.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:81)

[2022-05-09T11:33:18,945][WARN ][stderr                   ] [SERVER1] at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:112)

[2022-05-09T11:33:18,945][WARN ][stderr                   ] [SERVER1] at org.elasticsearch.cli.Command.main(Command.java:77)

[2022-05-09T11:33:18,945][WARN ][stderr                   ] [SERVER1] at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:122)

[2022-05-09T11:33:18,945][WARN ][stderr                   ] [SERVER1] at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:80)

[2022-05-09T11:33:18,945][WARN ][stderr                   ] [SERVER1] For complete error details, refer to the log at d:\elastic\elasticsearch\logs\elasticsearch.log

By setting the discovery type to single-node, a node will elect itself master and will not join a cluster with any other node.

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