How to add an already existing ElasticSearch server to Cluster?

We have a standalone ElasticSearch server having around 50 indices. We want to add this server to a cluster of 3 nodes which are new (having no data/indices). Is it achievable in Elastic search? Please suggest.

Yes this is possible.

Thank you mark.

If so, the data from those 50 inidices will get replicated onto the other servers?

As long as you have replicas enabled, yep.

Thanks a lot @warkolm. It worked

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