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Worker has already been shutdown
java.util.concurrent.RejectedExecutionException: Worker has already been 
shutdown	at org.elasticsearch.common.netty.channel.socket.nio.AbstractNioSelector.registerTask(AbstractNioSelector.java:120)	at org.elasticsearch.common.netty.channel.socket.nio.AbstractNioWorker.executeInIoThread(AbstractNioWorker.java:72)	at org.elasticsearch.common.netty.channel.socket.nio.NioWorker.executeInIoThread(NioWorker.java:36)	at org.elasticsearch.common.netty.channel.socket.nio.AbstractNioWorker.executeInIoThread(AbstractNioWorker.java:56)	at org.elasticsearch.common.netty.channel.socket.nio.NioWorker.executeInIoThread(NioWorker.java:36)	at org.elasticsearch.common.netty.channel.socket.nio.AbstractNioChannelSink.execute(AbstractNioChannelSink.java:34)	at org.elasticsearch.common.netty.channel.DefaultChannelPipeline.execute(DefaultChannelPipeline.java:636)	at org.elasticsearch.common.netty.channel.Channels.fireExceptionCaughtLater(Channels.java:496)	at org.elasticsearch.common.netty.channel.AbstractChannelSink.exceptionCaught(AbstractChannelSink.java:46)	at org.elasticsearch.common.netty.channel.DefaultChannelPipeline.notifyHandlerException(DefaultChannelPipeline.java:658)	at org.elasticsearch.common.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendDownstream(DefaultChannelPipeline.java:781)	at org.elasticsearch.common.netty.channel.Channels.write(Channels.java:725)	at org.elasticsearch.common.netty.handler.codec.oneone.OneToOneEncoder.doEncode(OneToOneEncoder.java:71)	at org.elasticsearch.common.netty.handler.codec.oneone.OneToOneEncoder.handleDownstream(OneToOneEncoder.java:59)	at org.elasticsearch.common.netty.channel.DefaultChannelPipeline.sendDownstream(DefaultChannelPipeline.java:591)	at org.elasticsearch.common.netty.channel.DefaultChannelPipeline.sendDownstream(DefaultChannelPipeline.java:582)	at org.elasticsearch.common.netty.channel.Channels.write(Channels.java:704)	at org.elasticsearch.common.netty.channel.Channels.write(Channels.java:671)	at org.elasticsearch.common.netty.channel.AbstractChannel.write(AbstractChannel.java:248)	at org.elasticsearch.http.netty.NettyHttpChannel.sendResponse(NettyHttpChannel.java:158)	at org.elasticsearch.rest.action.admin.cluster.node.stats.RestNodesStatsAction$1.onResponse(RestNodesStatsAction.java:122)	at org.elasticsearch.rest.action.admin.cluster.node.stats.RestNodesStatsAction$1.onResponse(RestNodesStatsAction.java:114)	at org.elasticsearch.action.support.nodes.TransportNodesOperationAction$AsyncAction.finishHim(TransportNodesOperationAction.java:227)	at org.elasticsearch.action.support.nodes.TransportNodesOperationAction$AsyncAction.onOperation(TransportNodesOperationAction.java:202)	at org.elasticsearch.action.support.nodes.TransportNodesOperationAction$AsyncAction.access$900(TransportNodesOperationAction.java:102)	at org.elasticsearch.action.support.nodes.TransportNodesOperationAction$AsyncAction$4.handleResponse(TransportNodesOperationAction.java:178)	at org.elasticsearch.action.support.nodes.TransportNodesOperationAction$AsyncAction$4.handleResponse(TransportNodesOperationAction.java:170)	at org.elasticsearch.transport.netty.MessageChannelHandler.handleResponse(MessageChannelHandler.java:154)	at org.elasticsearch.transport.netty.MessageChannelHandler.messageReceived(MessageChannelHandler.java:125)	at org.elasticsearch.common.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)	at org.elasticsearch.common.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)	at org.elasticsearch.common.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)	at org.elasticsearch.common.netty.channel.Channels.fireMessageReceived(Channels.java:296)	at org.elasticsearch.common.netty.handler.codec.frame.FrameDecoder.unfoldAndFireMessageReceived(FrameDecoder.java:462)	at org.elasticsearch.common.netty.handler.codec.frame.FrameDecoder.callDecode(FrameDecoder.java:443)	at org.elasticsearch.common.netty.handler.codec.frame.FrameDecoder.messageReceived(FrameDecoder.java:310)	at org.elasticsearch.common.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)	at org.elasticsearch.common.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)	at org.elasticsearch.common.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:559)	at org.elasticsearch.common.netty.channel.Channels.fireMessageReceived(Channels.java:268)	at org.elasticsearch.common.netty.channel.Channels.fireMessageReceived(Channels.java:255)	at org.elasticsearch.common.netty.channel.socket.nio.NioWorker.read(NioWorker.java:88)	at org.elasticsearch.common.netty.channel.socket.nio.AbstractNioWorker.process(AbstractNioWorker.java:108)	at org.elasticsearch.common.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:318)	at org.elasticsearch.common.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:89)	at org.elasticsearch.common.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178)	at org.elasticsearch.common.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)	at org.elasticsearch.common.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)	at java.lang.Thread.run(Thread.java:722)