Kibana showing data from two ES instances

Elastic Stack Elasticsearch
1

Hello, I would like to have two ES instances in different machines, but a Kibana interface able to access both of them. Something like this:

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How could I do it?
My first idea is to create a cluster with two nodes (1 node for ES instance 1 and the other one for ES instance 2) , but how could I create a cluster with nodes from diferent machines? which parameter should I change from elasticsearch.yml?

Thanks

2

The cluster.name needs to be the same, then change discovery.zen.ping.unicast.hosts as per here.