Adding a new node on a different subnet

[2018-03-23T08:41:16,604][INFO ][o.e.d.z.ZenDiscovery ] [] failed to send join request to master [{}{C1mZNUdPT460CGjpZ7C_6w}{W4ztO6y_SPagu1cVsNProQ}{}{}{ml.enabled=true}], reason [RemoteTransportException[[][][internal:discovery/zen/join]]; nested: IllegalStateException[failure when sending a validation request to node]; nested: RemoteTransportException[[][][internal:discovery/zen/join/validate]]; nested: IllegalArgumentException[Unknown NamedWriteable [org.elasticsearch.cluster.metadata.MetaData$Custom][licenses]]; ]

SOLVED - Had to install x-pack on the new node

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