Dear colleagues.
How to know the meaning and the reason for below log
[2016-06-08 12:19:50,322][DEBUG][action.bulk ] [Living Lightning] failed to execute [BulkShardRequest to [logstash-2016.06.08] containing [3] requests] on [[logstash-2016.06.08][1]]
[logstash-2016.06.08][[logstash-2016.06.08][1]] IllegalIndexShardStateException[CurrentState[POST_RECOVERY] operation only allowed when started/recovering, origin [PRIMARY]]
at org.elasticsearch.index.shard.IndexShard.ensureWriteAllowed(IndexShard.java:1062)
at org.elasticsearch.index.shard.IndexShard.create(IndexShard.java:538)
at org.elasticsearch.index.engine.Engine$Create.execute(Engine.java:810)
at org.elasticsearch.action.index.TransportIndexAction.executeIndexRequestOnPrimary(TransportIndexAction.java:237)
at org.elasticsearch.action.bulk.TransportShardBulkAction.shardIndexOperation(TransportShardBulkAction.java:326)
at org.elasticsearch.action.bulk.TransportShardBulkAction.shardOperationOnPrimary(TransportShardBulkAction.java:119)
at org.elasticsearch.action.bulk.TransportShardBulkAction.shardOperationOnPrimary(TransportShardBulkAction.java:68)
at org.elasticsearch.action.support.replication.TransportReplicationAction$PrimaryPhase.doRun(TransportReplicationAction.java:639)
at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37)
at org.elasticsearch.action.support.replication.TransportReplicationAction$PrimaryOperationTransportHandler.messageReceived(TransportReplicationAction.java:279)
at org.elasticsearch.action.support.replication.TransportReplicationAction$PrimaryOperationTransportHandler.messageReceived(TransportReplicationAction.java:271)
at org.elasticsearch.transport.RequestHandlerRegistry.processMessageReceived(RequestHandlerRegistry.java:75)
at org.elasticsearch.transport.TransportService$4.doRun(TransportService.java:376)
at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
[2016-06-08 12:20:10,857][INFO ][cluster.routing.allocation] [Living Lightning] Cluster health status changed from [RED] to [YELLOW] (reason: [shards started [[topbeat-2016.06.02][0], [topbeat-2016.06.02][0]] ...]).