We are using Elastic Search Nest client for our application , we did load testing testing on inserting documents into Elastic Search Cluster.
Whenever we increase the data node, performance get degraded.
Master Node : 1
Data Node : 1
Index Size 2Kb , Shard Count 4, replica 0
5 parallel thread , each thread synchronously pushing records(10000)
We could able to insert 25 record per second .
When we add the one more data node to cluster and created new insert . We could able to insert only 4 records per second ..
Is there anything am i missing?