What node i must send my data

Hey i have a small question
here is my cluster
Two master node
One data mode
And one coordination only node with my kibana

But in my logstash output elasticsearch i must send data all host(4node) or just send data node ?

In your case, you should send the data to the data node.

However, having two dedicated master nodes does not make sense, as there is no quorum for you to set the minimum_master_nodes to, you should consider adding a third dedicated master node so you can have quorum (and can set minimum_master_nodes to 2).

Additionally, having dedicated master nodes for a single-data-node cluster is definitely overkill, you could probably remove the use of dedicated master nodes in this case.

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