Add second elasticsearch node

Hi, please help to understand how can I add second Elasticsearch node.
So we have run Elasticsearch + kibana as docker containers.
Elasticsearch in config - "discovery.type=single-node", I want to add one more node as replica to another server and don't wont to lose data on existing.
How can I do that?

Is add "discovery.seed_hosts:" enough?

What should I change on existing node?
Thanks

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