Getting HTTP Status code 503 while indexing

Hi

We have one cluster with 32 nodes (16 noes in each data center). After
every 18 to 20 hrs or so some of the nodes are removed from cluster
automatically. We tried to increase the time between pings interval still
the issue is not getting resolve.

 Elasticsearch version : ealsticsearch-1.1.1
discovery.zen.ping.interval: 60s

Thanks
-Ganadhar

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