Most monitor two clusters?

Elastic Stack Elasticsearch
1


I set a monitor cluster,and i has four cluster to write data into the monitor cluster,but the page just show two clusters(other two clusters just change part nodes to write data to the monitor cluster)?

2

Multi-cluster monitoring is a subscription level feature, you can find more info here - https://www.elastic.co/subscriptions

3

It can monitor different version clusters,such as 2.3.1 and 2.3.3 ?

4

Yes.