How can I fix the following error?

4000000053232e70101b488c
org.elasticsearch.transport.ReceiveTimeoutTransportException:
[][inet[172.22.4.9:9300]][discovery/zen/unicast] request_id [9936241] timed
out after [3750ms]
@4000000053232e70101b505c at
org.elasticsearch.transport.TransportService$TimeoutHandler.run(TransportService.java:356)
@4000000053232e70101b5444 at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
@4000000053232e70101bdcfc at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
@4000000053232e70101be4cc at java.lang.Thread.run(Thread.java:724)
@4000000053232e742e0a2fac [2014-03-14 12:29:30,771][WARN
][discovery.zen.ping.unicast] [Alibar] failed to send ping to
[[#zen_unicast_1#][inet[172.22.4.9:9300]]]

@4000000053232e61193ca7bc [2014-03-14
12:27:21,015][DEBUG][action.search.type ] [Guardsman]
[logstash-2013.12.31][4], node[0y56HHo4Rv6kNdDFpOaauQ], [R], s[STARTED]:
Failed to execute [org.elasticsearch.action.search.SearchRequest@482b43cb]
lastShard [true]
@4000000053232e61193cb75c
org.elasticsearch.common.util.concurrent.EsRejectedExecutionException:
rejected execution (queue capacity 1000) on
org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction$4@595963a1
@4000000053232e61193cbf2c at
org.elasticsearch.common.util.concurrent.EsAbortPolicy.rejectedExecution(EsAbortPolicy.java:62)
@4000000053232e61193d1134 at
java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:821)
@4000000053232e61193d151c at
java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1372)
@4000000053232e61193d1904 at
org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction.onFirstPhaseResult(TransportSearchTypeAction.java:289)
@4000000053232e61193d1cec at
org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction$3.onFailure(TransportSearchTypeAction.java:224)
@4000000053232e61193d3074 at
org.elasticsearch.search.action.SearchServiceTransportAction$4.handleException(SearchServiceTransportAction.java:222)
@4000000053232e61193d4bcc at
org.elasticsearch.transport.netty.MessageChannelHandler.handleException(MessageChannelHandler.java:181)
@4000000053232e61193d4fb4 at
org.elasticsearch.transport.netty.MessageChannelHandler.handlerResponseError(MessageChannelHandler.java:171)
@4000000053232e61193d4fb4 at
org.elasticsearch.transport.netty.MessageChannelHandler.messageReceived(MessageChannelHandler.java:123)
@4000000053232e61193d5f54 at
org.elasticsearch.common.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
@4000000053232e61193d633c at
org.elasticsearch.common.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
@4000000053232e61193d6724 at
org.elasticsearch.common.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
@4000000053232e61193d76c4 at
org.elasticsearch.common.netty.channel.Channels.fireMessageReceived(Channels.java:296)
@4000000053232e61193d7aac at
org.elasticsearch.common.netty.handler.codec.frame.FrameDecoder.unfoldAndFireMessageReceived(FrameDecoder.java:462)
@4000000053232e61193d7e94 at
org.elasticsearch.common.netty.handler.codec.frame.FrameDecoder.callDecode(FrameDecoder.java:443)
@4000000053232e61193dccb4 at
org.elasticsearch.common.netty.handler.codec.frame.FrameDecoder.messageReceived(FrameDecoder.java:310)
@4000000053232e61193dd09c at
org.elasticsearch.common.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
@4000000053232e61193dd484 at
org.elasticsearch.common.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
@4000000053232e61193de424 at
org.elasticsearch.common.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:559)
@4000000053232e61193de80c at
org.elasticsearch.common.netty.channel.Channels.fireMessageReceived(Channels.java:268)
@4000000053232e61193de80c at
org.elasticsearch.common.netty.channel.Channels.fireMessageReceived(Channels.java:255)
@4000000053232e61193debf4 at
org.elasticsearch.common.netty.channel.socket.nio.NioWorker.read(NioWorker.java:88)
@4000000053232e61193df7ac at
org.elasticsearch.common.netty.channel.socket.nio.AbstractNioWorker.process(AbstractNioWorker.java:108)
@4000000053232e61193dfb94 at
org.elasticsearch.common.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:318)
@4000000053232e61193dff7c at
org.elasticsearch.common.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:89)
@4000000053232e61193e16ec at
org.elasticsearch.common.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178)
@4000000053232e61193e1ad4 at
org.elasticsearch.common.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)
@4000000053232e61193e1ebc at
org.elasticsearch.common.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)
@4000000053232e61193e1ebc at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
@4000000053232e61193e2e5c at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
@4000000053232e61193e3244 at java.lang.Thread.run(Thread.java:724)

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