Role of coordination nodes in cluster

Elastic Stack Elasticsearch
1

Hi All,
we have cluster of 17 nodes running elasticsearch 2.4.6 (outdated!).
we have 10 data nodes of i3.2xlarge, 3 master nodes m3.xlarge, 4 corrdinating nodes again m3.xlarge.

out of these 4 corrdiantion nodes we have kept 2 dedicated for write and 2 for read.

so question is, does having coordinating nodes add any value? or should I start using any of data nodes for same purpose?

this will save infra/operations cost for us.

Thanks in advanced.

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