Getting ClusterBlockException while running queries using node client

My elasticsearch cluster(version 2.0) is started and the node client is built successfully, but for some reason I'm getting the following error while running queries using node client.

20:15:15.479 [Pool:entitytaskscheduler: Thread#1] DEBUG c.b.o.e.t.c.DataCollectorStatusUpdateTask - collectors updated due to agent reconnected:{}
ClusterBlockException[blocked by: [SERVICE_UNAVAILABLE/1/state not recovered / initialized];]
at org.elasticsearch.cluster.block.ClusterBlocks.globalBlockedException(ClusterBlocks.java:154)
at org.elasticsearch.cluster.block.ClusterBlocks.globalBlockedRaiseException(ClusterBlocks.java:144)
at org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction.(TransportSearchTypeAction.java:116)
at org.elasticsearch.action.search.type.TransportSearchQueryThenFetchAction$AsyncAction.(TransportSearchQueryThenFetchAction.java:73)
at org.elasticsearch.action.search.type.TransportSearchQueryThenFetchAction$AsyncAction.(TransportSearchQueryThenFetchAction.java:67)
at org.elasticsearch.action.search.type.TransportSearchQueryThenFetchAction.doExecute(TransportSearchQueryThenFetchAction.java:64)
at org.elasticsearch.action.search.type.TransportSearchQueryThenFetchAction.doExecute(TransportSearchQueryThenFetchAction.java:53)
at org.elasticsearch.action.support.TransportAction.execute(TransportAction.java:70)
at org.elasticsearch.action.search.TransportSearchAction.doExecute(TransportSearchAction.java:99)
at org.elasticsearch.action.search.TransportSearchAction.doExecute(TransportSearchAction.java:44)
at org.elasticsearch.action.support.TransportAction.execute(TransportAction.java:70)
at org.elasticsearch.client.node.NodeClient.doExecute(NodeClient.java:58)
at org.elasticsearch.client.support.AbstractClient.execute(AbstractClient.java:347)
at org.elasticsearch.action.ActionRequestBuilder.execute(ActionRequestBuilder.java:85)
at org.elasticsearch.action.ActionRequestBuilder.execute(ActionRequestBuilder.java:59)
at com.hidden.ppp.management.dc.DataCollectorPollStatusDAOESImpl.findDCIdsUpdatedInTime(DataCollectorPollStatusDAOESImpl.java:151)
at com.hidden.ppp.engine.taskexecutor.cptaskexecs.DataCollectorStatusUpdateTask.execute(DataCollectorStatusUpdateTask.java:199)
at com.hidden.ppp.engine.taskexecutor.cptaskexecs.DataCollectorStatusUpdateTaskRunner.run(DataCollectorStatusUpdateTaskRunner.java:27)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
20:15:15.558 [Pool:entitytaskscheduler: Thread#1] WARN c.b.o.m.d.DataCollectorPollStatusDAOESImpl - blocked by: [SERVICE_UNAVAILABLE/1/state not recovered / initialized];
20:15:15.558 [Pool:entitytaskscheduler: Thread#1] DEBUG c.b.o.e.t.c.DataCollectorStatusUpdateTask - collectors for which polls updated after epoc time:1453128243336 - dcids: []
ClusterBlockException[blocked by: [SERVICE_UNAVAILABLE/1/state not recovered / initialized];]
at org.elasticsearch.cluster.block.ClusterBlocks.globalBlockedException(ClusterBlocks.java:154)
at org.elasticsearch.cluster.block.ClusterBlocks.globalBlockedRaiseException(ClusterBlocks.java:144)
at org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction.(TransportSearchTypeAction.java:116)
at org.elasticsearch.action.search.type.TransportSearchQueryThenFetchAction$AsyncAction.(TransportSearchQueryThenFetchAction.java:73)
at org.elasticsearch.action.search.type.TransportSearchQueryThenFetchAction$AsyncAction.(TransportSearchQueryThenFetchAction.java:67)

I've even disabled the "multicast" as per this post - still no luck. Surprisingly, I could access the elasticsearch from sense. Any clues on what is going wrong ?

It would be useful for other users who might experience this issue in the future if you could explain how you resolved the issue?

I take back from statement: I'm still getting the exception :frowning: Please help. This is the latest exception:

org.elasticsearch.discovery.MasterNotDiscoveredException: waited for [30s]
at org.elasticsearch.action.support.master.TransportMasterNodeAction$4.onTimeout(TransportMasterNodeAction.java:154) ~[agent-foundation-2.5.00-RELEASE.jar:na]
at org.elasticsearch.cluster.ClusterStateObserver$ObserverClusterStateListener.onTimeout(ClusterStateObserver.java:239) ~[agent-foundation-2.5.00-RELEASE.jar:na]
at org.elasticsearch.cluster.service.InternalClusterService$NotifyTimeout.run(InternalClusterService.java:574) ~[agent-foundation-2.5.00-RELEASE.jar:na]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_66]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_66]
at java.lang.Thread.run(Thread.java:745) [na:1.8.0_66]