Hi
One of the person said that he uses 2 node cluster for Elastic Search and he has set both the nodes to master and it does the job. Is this a feasible way of doing it ?
I've seen in Red Hat Cluster that they have 2 node cluster which works fine.
Having two master-eligible nodes works, but you might end up in a split brain situation which can be quite tedious to recover from. An odd number of master-eligible nodes is preferable.
Agreed. It technically works, but is not recommended at all. If I were standing up a small cluster, I would either have a single node, or jump immediately to three nodes so that you can have a useful quorum size.
A cluster of two nodes is just asking for problems in my opinion.
+1. If you really want it to be 2-nodes, make one of the nodes only master (though u will have single point of failure) and both nodes as data nodes. 
Just go with 3 nodes and be safe 
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