Gernerate new cluster_uuid in Elasticsearch

Question

We´ve cloned two VMWare instances with ES (= two nodes in the same cluster) so that we can use them on another part of our network. I´ve set a new cluster name for both machines / nodes and everything works fine.

The only "problem" I see is, that the new machines / nodes have the same cluster_uuid as the orignal ones (although they have a different cluster_name). Can this become an issue? And if so - can I regenerate the uuid for the new cluster?

Thanks & BR

Answer 1

Try to remove (or just rename) _state directory with metadata under /<path.data>/<cluster.name>/nodes/0, Elasticsearch will recreate it on next startup with new random uuid. Indices will be imported, but transient & persistent settings, mappings, etc will be lost.