We are using clustered elasticsearch setup in our environment. We have a 4 nodes in a cluster. But, sometimes, every nodes acts as a separate cluster. Whenever i tried to run [elasticsearchnode]/_cat/nodes?v. Everytime gives different node name as output. After that, we restarted the elasticsearch services. Now, it seems to be joined into the cluster but elasticsearch logs, we are seeing "Caused by: org.elasticsearch.common.util.concurrent.EsRejectedExecutionException: rejected execution (queue capacity 100) on org.elasticsearch.transport.netty.MessageChannelHandler$RequestHandler@7db74275". Tried with setting threadpool configuration and unicast configuration. Did not works still.
Elasticsearch version: 1.3.3