elasticsearch/docs/reference/setup/important-settings/cluster-name.asciidoc

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[discrete]
==== Cluster name setting
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 that describes the purpose of the cluster.
[source,yaml]
--------------------------------------------------
cluster.name: logging-prod
--------------------------------------------------
IMPORTANT: Do not reuse the same cluster names in different environments.
Otherwise, nodes might join the wrong cluster.
NOTE: Changing the name of a cluster requires a <<restart-cluster-full,full
cluster restart>>.