RejectedExecutionException

[2017-11-02T10:35:44,801][ERROR][i.n.u.c.D.rejectedExecution] Failed to submit a listener notification task. Event loop shut down?
java.util.concurrent.RejectedExecutionException: event executor terminated
	at io.netty.util.concurrent.SingleThreadEventExecutor.reject(SingleThreadEventExecutor.java:821) ~[?:?]
	at io.netty.util.concurrent.SingleThreadEventExecutor.offerTask(SingleThreadEventExecutor.java:327) ~[?:?]
	at io.netty.util.concurrent.SingleThreadEventExecutor.addTask(SingleThreadEventExecutor.java:320) ~[?:?]
	at io.netty.util.concurrent.SingleThreadEventExecutor.execute(SingleThreadEventExecutor.java:746) ~[?:?]
	at io.netty.util.concurrent.DefaultPromise.safeExecute(DefaultPromise.java:760) ~[?:?]
	at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:428) ~[?:?]
	at io.netty.util.concurrent.DefaultPromise.addListener(DefaultPromise.java:163) ~[?:?]
	at io.netty.channel.DefaultChannelPromise.addListener(DefaultChannelPromise.java:93) ~[?:?]
	at io.netty.channel.DefaultChannelPromise.addListener(DefaultChannelPromise.java:28) ~[?:?]
	at org.elasticsearch.transport.netty4.Netty4Transport.sendMessage(Netty4Transport.java:396) ~[?:?]
	at org.elasticsearch.transport.netty4.Netty4Transport.sendMessage(Netty4Transport.java:94) ~[?:?]
	at org.elasticsearch.transport.TcpTransport.internalSendMessage(TcpTransport.java:1111) ~[elasticsearch-5.6.1.jar:5.6.1]
	at org.elasticsearch.transport.TcpTransport.sendResponse(TcpTransport.java:1184) ~[elasticsearch-5.6.1.jar:5.6.1]
	at org.elasticsearch.transport.TcpTransport.sendResponse(TcpTransport.java:1154) ~[elasticsearch-5.6.1.jar:5.6.1]
	at org.elasticsearch.transport.TcpTransportChannel.sendResponse(TcpTransportChannel.java:67) ~[elasticsearch-5.6.1.jar:5.6.1]
	at org.elasticsearch.transport.TcpTransportChannel.sendResponse(TcpTransportChannel.java:61) ~[elasticsearch-5.6.1.jar:5.6.1]
	at org.elasticsearch.transport.DelegatingTransportChannel.sendResponse(DelegatingTransportChannel.java:60) ~[elasticsearch-5.6.1.jar:5.6.1]
	at org.elasticsearch.transport.RequestHandlerRegistry$TransportChannelWrapper.sendResponse(RequestHandlerRegistry.java:111) ~[elasticsearch-5.6.1.jar:5.6.1]
	at org.elasticsearch.action.support.replication.TransportReplicationAction$OperationTransportHandler$1.onResponse(TransportReplicationAction.java:222) ~[elasticsearch-5.6.1.jar:5.6.1]
	at org.elasticsearch.action.support.replication.TransportReplicationAction$OperationTransportHandler$1.onResponse(TransportReplicationAction.java:218) ~[elasticsearch-5.6.1.jar:5.6.1]
	at org.elasticsearch.action.support.replication.TransportReplicationAction$ReroutePhase.finishOnSuccess(TransportReplicationAction.java:885) ~[elasticsearch-5.6.1.jar:5.6.1]
	at org.elasticsearch.action.support.replication.TransportReplicationAction$ReroutePhase$1.handleResponse(TransportReplicationAction.java:794) ~[elasticsearch-5.6.1.jar:5.6.1]
	at org.elasticsearch.action.support.replication.TransportReplicationAction$ReroutePhase$1.handleResponse(TransportReplicationAction.java:780) ~[elasticsearch-5.6.1.jar:5.6.1]
	at org.elasticsearch.transport.TransportService$ContextRestoreResponseHandler.handleResponse(TransportService.java:1060) ~[elasticsearch-5.6.1.jar:5.6.1]
	at org.elasticsearch.transport.TransportService$DirectResponseChannel.processResponse(TransportService.java:1134) ~[elasticsearch-5.6.1.jar:5.6.1]
	at org.elasticsearch.transport.TransportService$DirectResponseChannel.sendResponse(TransportService.java:1124) ~[elasticsearch-5.6.1.jar:5.6.1]
	at org.elasticsearch.transport.TransportService$DirectResponseChannel.sendResponse(TransportService.java:1113) ~[elasticsearch-5.6.1.jar:5.6.1]
	at org.elasticsearch.transport.DelegatingTransportChannel.sendResponse(DelegatingTransportChannel.java:60) ~[elasticsearch-5.6.1.jar:5.6.1]
	at org.elasticsearch.transport.RequestHandlerRegistry$TransportChannelWrapper.sendResponse(RequestHandlerRegistry.java:111) ~[elasticsearch-5.6.1.jar:5.6.1]
	at org.elasticsearch.action.support.replication.TransportReplicationAction$AsyncPrimaryAction$2.onResponse(TransportReplicationAction.java:371) ~[elasticsearch-5.6.1.jar:5.6.1]
	at org.elasticsearch.action.support.replication.TransportReplicationAction$AsyncPrimaryAction$2.onResponse(TransportReplicationAction.java:365) ~[elasticsearch-5.6.1.jar:5.6.1]
	at org.elasticsearch.action.support.replication.TransportReplicationAction$PrimaryResult.respond(TransportReplicationAction.java:437) ~[elasticsearch-5.6.1.jar:5.6.1]
	at org.elasticsearch.action.support.replication.TransportWriteAction$WritePrimaryResult.respondIfPossible(TransportWriteAction.java:127) ~[elasticsearch-5.6.1.jar:5.6.1]
	at org.elasticsearch.action.support.replication.TransportWriteAction$WritePrimaryResult.respond(TransportWriteAction.java:118) ~[elasticsearch-5.6.1.jar:5.6.1]
	at org.elasticsearch.action.support.replication.TransportReplicationAction$AsyncPrimaryAction.lambda$onResponse$0(TransportReplicationAction.java:343) ~[elasticsearch-5.6.1.jar:5.6.1]
	at org.elasticsearch.action.ActionListener$1.onResponse(ActionListener.java:59) ~[elasticsearch-5.6.1.jar:5.6.1]
	at org.elasticsearch.action.support.replication.ReplicationOperation.finish(ReplicationOperation.java:304) ~[elasticsearch-5.6.1.jar:5.6.1]
	at org.elasticsearch.action.support.replication.ReplicationOperation.decPendingAndFinishIfNeeded(ReplicationOperation.java:285) ~[elasticsearch-5.6.1.jar:5.6.1]
	at org.elasticsearch.action.support.replication.ReplicationOperation.lambda$markUnavailableShardsAsStale$0(ReplicationOperation.java:151) ~[elasticsearch-5.6.1.jar:5.6.1]
	at org.elasticsearch.action.support.replication.TransportReplicationAction$ReplicasProxy$1.onFailure(TransportReplicationAction.java:1037) [elasticsearch-5.6.1.jar:5.6.1]
	at org.elasticsearch.cluster.action.shard.ShardStateAction$1.handleException(ShardStateAction.java:117) [elasticsearch-5.6.1.jar:5.6.1]
	at org.elasticsearch.transport.TransportService$ContextRestoreResponseHandler.handleException(TransportService.java:1067) [elasticsearch-5.6.1.jar:5.6.1]
	at org.elasticsearch.transport.TransportService$4.doRun(TransportService.java:264) [elasticsearch-5.6.1.jar:5.6.1]
	at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:638) [elasticsearch-5.6.1.jar:5.6.1]
	at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) [elasticsearch-5.6.1.jar:5.6.1]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [?:1.8.0_65]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [?:1.8.0_65]
	at java.lang.Thread.run(Thread.java:745) [?:1.8.0_65]
[2017-11-02T10:35:45,037][INFO ][o.e.n.Node               ] [ubuntu-200] stopped
[2017-11-02T10:35:45,037][INFO ][o.e.n.Node               ] [ubuntu-200] closing ...
[2017-11-02T10:35:45,078][INFO ][o.e.n.Node               ] [ubuntu-200] closed