Elastic Search 5.2.2 : Merge

Merge is happening more on replica. I have only 1 replica with 6 nodes with 3 shards. I just switched over 5.2 from 1.7 and Saw that replica nodes are having more merge and more fetch too.

This is degrading my bulk index performance. My Through put is as below

Index 4.6k
Search 11k

Merge on Primary : 0.6k
Merge On Replicas : 4.5k

Merge Docs On Replica : 2M
Merge Docs on Primary : 1M

I am running with highest possible Threads and queue Configuration

CPU 16 core and memory 30 GB per node

Can somebody help me to understand it.

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