We have a environment with 5 nodes(Windows) with Elastic search version 0.90.13.
We got a issue, when we checked with "_cluster/health"
We are got the response "status:green", but number of node was displayed as 4 instead of 5.
Once we restart the Elastic Search Service, then everything was all set - we got 5 nodes with green status.
We are not sure why this issue came, and also not clear how it was get fixed post restarting the Elastic Search Service in the Node.
Request your help to understand why this issue came and how it was get fixed post restart the ES service in the server, and how to provide solution to this problem