Improve search performance in cluster

Elastic Stack Elasticsearch
1

Hi every body, if I add a few servers to the cluster in replica role, will it improve cluster search performance? or I will get only data copy and cluster performance will have no changes.

2

There's no such thing as "replica roles" for nodes. All data nodes are equals. It's likely that you'll get a performance gain, but it depends on how much data you have, how it's sharded, what kind of hardware you have, what kind of queries you make, and so on.

3

You might want to look at the client node. Client nodes do not run the data service and only serve as a HTTP loadbalancer of sorts for the cluster.

https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-node.html

4

Thanks for the link!