Add another ElasticSearch node to existing Graylog server


I am wondering if I can add one or two ElasticSearch nodes to existing Graylog server 4.0 and ElasticSearch node that already runnig on the same server with Graylog.
I want to build ElasticSearch cluster with existing Graylog server and not lose data that already collected.

Curren cogiguration is:
All in one Graylog server 4.0, ElasticSerach and MongoDB running on one server.

Thanks in advance

From here: Multi-node Setup — Graylog 3.0.2 documentation

It seems more about how to add an Elastic Search node:

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