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Elastic Docs ›Elasticsearch Guide [7.3] ›Set up Elasticsearch ›Important Elasticsearch configuration

cluster.name

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cluster.name

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A node can only join a cluster when it shares its cluster.name with all the other nodes in the cluster. The default name is elasticsearch, but you should change it to an appropriate name which describes the purpose of the cluster.

cluster.name: logging-prod

Make sure that you don’t reuse the same cluster names in different environments, otherwise you might end up with nodes joining the wrong cluster.

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