Elastic Cluster tuning for optimal performance

We have a cluster of Elastic Search which consists of 5 nodes(8CPU, 16 GB
RAM). The overall performance EPS(events per second) we could achieve is
around 11K. The increase in overall EPS is not much from 3 nodes to 4 nodes
to 5 nodes. Do we need to do any specific tuning which would help in
scaling better i.e., specific shard size, no of shards etc etc. Any inputs
would be helpful.


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