centos7.6环境下elasticsearch7.5.1客户端创建大量连接队列导致无法响应请求报错 queue capacity = 1000的处理...

集群环境：
centos7.6 + elasticsearch7.5.1
3台集群服务器，三台服务器都是8核32G内存，SSD磁盘，都充当数据节点，一台主节点现象：
es集群状态是绿色，es的磁盘io和cpu使用率都很高，php客户端连接查询超时集群日志出现大量如下报错：
[2020-05-12T21:13:24,612][DEBUG][o.e.a.s.TransportSearchAction] [eus_influenex_es01] [video][1], node[OT_iJxV0TiSpzwMp7mnung], [P], s[STARTED], a[id=RjyL6IxrSYe7yOGN5oR64g]: Failed to execute [SearchRequest{searchType=QUERY_THEN_FETCH, indices=[video], indicesOptions=IndicesOptions[ignore_unavailable=false, allow_no_indices=true, expand_wildcards_open=true, expand_wildcards_closed=false, allow_aliases_to_multiple_indices=true, forbid_closed_indices=true, ignore_aliases=false, ignore_throttled=true], types=[], routing='null', preference='null', requestCache=null, scroll=Scroll{keepAlive=5m}, maxConcurrentShardRequests=0, batchedReduceSize=512, preFilterShardSize=128, allowPartialSearchResults=true, localClusterAlias=null, getOrCreateAbsoluteStartMillis=-1, ccsMinimizeRoundtrips=true, source={"size":5000,"timeout":"30s","query":{"bool":{"must":[{"range":{"upload_date":{"from":"now-1d/d","to":"now/d","include_lower":true,"include_upper":true,"boost":1.0}}},{"bool":{"should":[{"match_phrase":{"description":{"query":"Legend_of_Keepers_Career_of_a_Dungeon_Master","slop":0,"zero_terms_query":"NONE","boost":1.0}}},{"match_phrase":{"title":{"query":"Legend_of_Keepers_Career_of_a_Dungeon_Master","slop":0,"zero_terms_query":"NONE","boost":1.0}}},{"match_phrase":{"tags":{"query":"Legend_of_Keepers_Career_of_a_Dungeon_Master","slop":0,"zero_terms_query":"NONE","boost":1.0}}},{"match_phrase":{"topic":{"query":"Legend_of_Keepers_Career_of_a_Dungeon_Master","slop":0,"zero_terms_query":"NONE","boost":1.0}}}],"adjust_pure_negative":true,"boost":1.0}}],"adjust_pure_negative":true,"boost":1.0}},"_source":{"includes":["channel_id"],"excludes":[]}}}] lastShard [true]
org.elasticsearch.transport.RemoteTransportException: [es02][172.16.0.11:9300][indices:data/read/search[phase/query]]
Caused by: org.elasticsearch.common.util.concurrent.EsRejectedExecutionException: rejected execution of org.elasticsearch.common.util.concurrent.TimedRunnable@4d44d731 on QueueResizingEsThreadPoolExecutor[name = es02/search, queue capacity = 1000, min queue capacity = 1000, max queue capacity = 1000, frame size = 2000, targeted response rate = 1s, task execution EWMA = 540.3ms, adjustment amount = 50, org.elasticsearch.common.util.concurrent.QueueResizingEsThreadPoolExecutor@3a63dad4[Running, pool size = 13, active threads = 13, queued tasks = 1000, completed tasks = 8399]]at org.elasticsearch.common.util.concurrent.EsAbortPolicy.rejectedExecution(EsAbortPolicy.java:48) ~[elasticsearch-7.5.1.jar:7.5.1]at java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:825) ~[?:?]at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1355) ~[?:?]at org.elasticsearch.common.util.concurrent.EsThreadPoolExecutor.execute(EsThreadPoolExecutor.java:84) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.search.SearchService.lambda$rewriteShardRequest$7(SearchService.java:1065) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.index.shard.IndexShard.awaitShardSearchActive(IndexShard.java:3290) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.search.SearchService.lambda$rewriteShardRequest$8(SearchService.java:1065) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.action.ActionListener$1.onResponse(ActionListener.java:63) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.index.query.Rewriteable.rewriteAndFetch(Rewriteable.java:114) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.index.query.Rewriteable.rewriteAndFetch(Rewriteable.java:87) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.search.SearchService.rewriteShardRequest(SearchService.java:1070) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.search.SearchService.executeQueryPhase(SearchService.java:340) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.action.search.SearchTransportService.lambda$registerRequestHandler$6(SearchTransportService.java:334) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.xpack.security.transport.SecurityServerTransportInterceptor$ProfileSecuredRequestHandler$1.doRun(SecurityServerTransportInterceptor.java:257) ~[?:?]at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.common.util.concurrent.EsExecutors$DirectExecutorService.execute(EsExecutors.java:225) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.xpack.security.transport.SecurityServerTransportInterceptor$ProfileSecuredRequestHandler.lambda$messageReceived$0(SecurityServerTransportInterceptor.java:306) ~[?:?]at org.elasticsearch.action.ActionListener$1.onResponse(ActionListener.java:63) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.xpack.security.authz.AuthorizationService.lambda$runRequestInterceptors$15(AuthorizationService.java:344) ~[?:?]at org.elasticsearch.action.ActionListener$1.onResponse(ActionListener.java:63) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.common.util.concurrent.ListenableFuture$1.doRun(ListenableFuture.java:112) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.common.util.concurrent.EsExecutors$DirectExecutorService.execute(EsExecutors.java:225) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.common.util.concurrent.ListenableFuture.notifyListener(ListenableFuture.java:106) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.common.util.concurrent.ListenableFuture.lambda$done$0(ListenableFuture.java:98) ~[elasticsearch-7.5.1.jar:7.5.1]at java.util.ArrayList.forEach(ArrayList.java:1507) ~[?:?]at org.elasticsearch.common.util.concurrent.ListenableFuture.done(ListenableFuture.java:98) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.common.util.concurrent.BaseFuture.set(BaseFuture.java:144) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.common.util.concurrent.ListenableFuture.onResponse(ListenableFuture.java:127) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.action.StepListener.innerOnResponse(StepListener.java:62) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.action.NotifyOnceListener.onResponse(NotifyOnceListener.java:40) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.xpack.security.authz.interceptor.FieldAndDocumentLevelSecurityRequestInterceptor.intercept(FieldAndDocumentLevelSecurityRequestInterceptor.java:61) ~[?:?]at org.elasticsearch.xpack.security.authz.interceptor.SearchRequestInterceptor.intercept(SearchRequestInterceptor.java:19) ~[?:?]at org.elasticsearch.xpack.security.authz.AuthorizationService.lambda$runRequestInterceptors$14(AuthorizationService.java:339) ~[?:?]at org.elasticsearch.action.ActionListener$1.onResponse(ActionListener.java:63) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.common.util.concurrent.ListenableFuture$1.doRun(ListenableFuture.java:112) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.common.util.concurrent.EsExecutors$DirectExecutorService.execute(EsExecutors.java:225) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.common.util.concurrent.ListenableFuture.notifyListener(ListenableFuture.java:106) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.common.util.concurrent.ListenableFuture.lambda$done$0(ListenableFuture.java:98) ~[elasticsearch-7.5.1.jar:7.5.1]at java.util.ArrayList.forEach(ArrayList.java:1507) ~[?:?]at org.elasticsearch.common.util.concurrent.ListenableFuture.done(ListenableFuture.java:98) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.common.util.concurrent.BaseFuture.set(BaseFuture.java:144) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.common.util.concurrent.ListenableFuture.onResponse(ListenableFuture.java:127) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.action.StepListener.innerOnResponse(StepListener.java:62) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.action.NotifyOnceListener.onResponse(NotifyOnceListener.java:40) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.xpack.security.authz.interceptor.BulkShardRequestInterceptor.intercept(BulkShardRequestInterceptor.java:71) ~[?:?]at org.elasticsearch.xpack.security.authz.AuthorizationService.lambda$runRequestInterceptors$14(AuthorizationService.java:339) ~[?:?]at org.elasticsearch.action.ActionListener$1.onResponse(ActionListener.java:63) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.common.util.concurrent.ListenableFuture$1.doRun(ListenableFuture.java:112) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.common.util.concurrent.EsExecutors$DirectExecutorService.execute(EsExecutors.java:225) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.common.util.concurrent.ListenableFuture.notifyListener(ListenableFuture.java:106) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.common.util.concurrent.ListenableFuture.lambda$done$0(ListenableFuture.java:98) ~[elasticsearch-7.5.1.jar:7.5.1]at java.util.ArrayList.forEach(ArrayList.java:1507) ~[?:?]at org.elasticsearch.common.util.concurrent.ListenableFuture.done(ListenableFuture.java:98) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.common.util.concurrent.BaseFuture.set(BaseFuture.java:144) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.common.util.concurrent.ListenableFuture.onResponse(ListenableFuture.java:127) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.action.StepListener.innerOnResponse(StepListener.java:62) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.action.NotifyOnceListener.onResponse(NotifyOnceListener.java:40) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.xpack.security.authz.interceptor.IndicesAliasesRequestInterceptor.intercept(IndicesAliasesRequestInterceptor.java:102) ~[?:?]at org.elasticsearch.xpack.security.authz.AuthorizationService.lambda$runRequestInterceptors$14(AuthorizationService.java:339) ~[?:?]at org.elasticsearch.action.ActionListener$1.onResponse(ActionListener.java:63) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.common.util.concurrent.ListenableFuture$1.doRun(ListenableFuture.java:112) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.common.util.concurrent.EsExecutors$DirectExecutorService.execute(EsExecutors.java:225) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.common.util.concurrent.ListenableFuture.notifyListener(ListenableFuture.java:106) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.common.util.concurrent.ListenableFuture.lambda$done$0(ListenableFuture.java:98) ~[elasticsearch-7.5.1.jar:7.5.1]at java.util.ArrayList.forEach(ArrayList.java:1507) ~[?:?]at org.elasticsearch.common.util.concurrent.ListenableFuture.done(ListenableFuture.java:98) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.common.util.concurrent.BaseFuture.set(BaseFuture.java:144) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.common.util.concurrent.ListenableFuture.onResponse(ListenableFuture.java:127) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.action.StepListener.innerOnResponse(StepListener.java:62) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.action.NotifyOnceListener.onResponse(NotifyOnceListener.java:40) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.xpack.security.authz.interceptor.FieldAndDocumentLevelSecurityRequestInterceptor.intercept(FieldAndDocumentLevelSecurityRequestInterceptor.java:61) ~[?:?]at org.elasticsearch.xpack.security.authz.interceptor.UpdateRequestInterceptor.intercept(UpdateRequestInterceptor.java:23) ~[?:?]at org.elasticsearch.xpack.security.authz.AuthorizationService.lambda$runRequestInterceptors$14(AuthorizationService.java:339) ~[?:?]at org.elasticsearch.action.ActionListener$1.onResponse(ActionListener.java:63) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.common.util.concurrent.ListenableFuture$1.doRun(ListenableFuture.java:112) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.common.util.concurrent.EsExecutors$DirectExecutorService.execute(EsExecutors.java:225) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.common.util.concurrent.ListenableFuture.notifyListener(ListenableFuture.java:106) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.common.util.concurrent.ListenableFuture.lambda$done$0(ListenableFuture.java:98) ~[elasticsearch-7.5.1.jar:7.5.1]at java.util.ArrayList.forEach(ArrayList.java:1507) ~[?:?]at org.elasticsearch.common.util.concurrent.ListenableFuture.done(ListenableFuture.java:98) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.common.util.concurrent.BaseFuture.set(BaseFuture.java:144) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.common.util.concurrent.ListenableFuture.onResponse(ListenableFuture.java:127) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.action.StepListener.innerOnResponse(StepListener.java:62) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.action.NotifyOnceListener.onResponse(NotifyOnceListener.java:40) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.xpack.security.authz.interceptor.ResizeRequestInterceptor.intercept(ResizeRequestInterceptor.java:82) ~[?:?]at org.elasticsearch.xpack.security.authz.AuthorizationService.runRequestInterceptors(AuthorizationService.java:345) ~[?:?]at org.elasticsearch.xpack.security.authz.AuthorizationService.handleIndexActionAuthorizationResult(AuthorizationService.java:322) ~[?:?]at org.elasticsearch.xpack.security.authz.AuthorizationService.lambda$authorizeAction$9(AuthorizationService.java:263) ~[?:?]at org.elasticsearch.xpack.security.authz.AuthorizationService$AuthorizationResultListener.onResponse(AuthorizationService.java:616) ~[?:?]at org.elasticsearch.xpack.security.authz.AuthorizationService$AuthorizationResultListener.onResponse(AuthorizationService.java:591) ~[?:?]at org.elasticsearch.action.support.ContextPreservingActionListener.onResponse(ContextPreservingActionListener.java:43) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.xpack.security.authz.RBACEngine.buildIndicesAccessControl(RBACEngine.java:507) ~[?:?]at org.elasticsearch.xpack.security.authz.RBACEngine.lambda$authorizeIndexAction$3(RBACEngine.java:298) ~[?:?]at org.elasticsearch.action.ActionListener$1.onResponse(ActionListener.java:63) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.xpack.security.authz.AuthorizationService$CachingAsyncSupplier.lambda$getAsync$0(AuthorizationService.java:653) ~[?:?]at org.elasticsearch.action.ActionListener$1.onResponse(ActionListener.java:63) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.xpack.security.authz.AuthorizationService.resolveIndexNames(AuthorizationService.java:554) ~[?:?]at org.elasticsearch.xpack.security.authz.AuthorizationService.lambda$authorizeAction$6(AuthorizationService.java:251) ~[?:?]at org.elasticsearch.action.ActionListener$1.onResponse(ActionListener.java:63) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.xpack.security.authz.AuthorizationService$CachingAsyncSupplier.lambda$getAsync$0(AuthorizationService.java:653) ~[?:?]at org.elasticsearch.action.ActionListener$1.onResponse(ActionListener.java:63) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.xpack.security.authz.RBACEngine.loadAuthorizedIndices(RBACEngine.java:329) ~[?:?]at org.elasticsearch.xpack.security.authz.AuthorizationService.lambda$authorizeAction$5(AuthorizationService.java:247) ~[?:?]at org.elasticsearch.xpack.security.authz.AuthorizationService$CachingAsyncSupplier.getAsync(AuthorizationService.java:651) ~[?:?]at org.elasticsearch.xpack.security.authz.AuthorizationService.lambda$authorizeAction$8(AuthorizationService.java:250) ~[?:?]at org.elasticsearch.xpack.security.authz.AuthorizationService$CachingAsyncSupplier.getAsync(AuthorizationService.java:651) ~[?:?]at org.elasticsearch.xpack.security.authz.RBACEngine.lambda$authorizeIndexAction$4(RBACEngine.java:290) ~[?:?]at org.elasticsearch.action.ActionListener$1.onResponse(ActionListener.java:63) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.xpack.security.authz.RBACEngine.authorizeIndexActionName(RBACEngine.java:314) ~[?:?]at org.elasticsearch.xpack.security.authz.RBACEngine.authorizeIndexAction(RBACEngine.java:287) ~[?:?]at org.elasticsearch.xpack.security.authz.AuthorizationService.authorizeAction(AuthorizationService.java:261) ~[?:?]at org.elasticsearch.xpack.security.authz.AuthorizationService.maybeAuthorizeRunAs(AuthorizationService.java:227) ~[?:?]at org.elasticsearch.xpack.security.authz.AuthorizationService.lambda$authorize$1(AuthorizationService.java:193) ~[?:?]at org.elasticsearch.action.ActionListener$1.onResponse(ActionListener.java:63) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.action.support.ContextPreservingActionListener.onResponse(ContextPreservingActionListener.java:43) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.xpack.security.authz.RBACEngine.lambda$resolveAuthorizationInfo$1(RBACEngine.java:117) ~[?:?]at org.elasticsearch.action.ActionListener$1.onResponse(ActionListener.java:63) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.xpack.security.authz.store.CompositeRolesStore.getRoles(CompositeRolesStore.java:229) ~[?:?]at org.elasticsearch.xpack.security.authz.RBACEngine.getRoles(RBACEngine.java:123) ~[?:?]at org.elasticsearch.xpack.security.authz.RBACEngine.resolveAuthorizationInfo(RBACEngine.java:111) ~[?:?]at org.elasticsearch.xpack.security.authz.AuthorizationService.authorize(AuthorizationService.java:195) ~[?:?]at org.elasticsearch.xpack.security.transport.ServerTransportFilter$NodeProfile.lambda$inbound$1(ServerTransportFilter.java:130) ~[?:?]at org.elasticsearch.action.ActionListener$1.onResponse(ActionListener.java:63) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.xpack.security.authc.AuthenticationService$Authenticator.lambda$authenticateAsync$2(AuthenticationService.java:246) ~[?:?]at org.elasticsearch.xpack.security.authc.AuthenticationService$Authenticator.lambda$lookForExistingAuthentication$6(AuthenticationService.java:306) ~[?:?]at org.elasticsearch.xpack.security.authc.AuthenticationService$Authenticator.lookForExistingAuthentication(AuthenticationService.java:317) ~[?:?]at org.elasticsearch.xpack.security.authc.AuthenticationService$Authenticator.authenticateAsync(AuthenticationService.java:244) ~[?:?]at org.elasticsearch.xpack.security.authc.AuthenticationService$Authenticator.access$000(AuthenticationService.java:196) ~[?:?]at org.elasticsearch.xpack.security.authc.AuthenticationService.authenticate(AuthenticationService.java:139) ~[?:?]at org.elasticsearch.xpack.security.transport.ServerTransportFilter$NodeProfile.inbound(ServerTransportFilter.java:121) ~[?:?]at org.elasticsearch.xpack.security.transport.SecurityServerTransportInterceptor$ProfileSecuredRequestHandler.messageReceived(SecurityServerTransportInterceptor.java:313) ~[?:?]at org.elasticsearch.transport.RequestHandlerRegistry.processMessageReceived(RequestHandlerRegistry.java:63) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.transport.InboundHandler$RequestHandler.doRun(InboundHandler.java:264) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.common.util.concurrent.EsExecutors$DirectExecutorService.execute(EsExecutors.java:225) ~[elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.transport.InboundHandler.handleRequest(InboundHandler.java:185) [elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.transport.InboundHandler.messageReceived(InboundHandler.java:118) [elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.transport.InboundHandler.inboundMessage(InboundHandler.java:102) [elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.transport.TcpTransport.inboundMessage(TcpTransport.java:667) [elasticsearch-7.5.1.jar:7.5.1]at org.elasticsearch.transport.netty4.Netty4MessageChannelHandler.channelRead(Netty4MessageChannelHandler.java:62) [transport-netty4-client-7.5.1.jar:7.5.1]at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374) [netty-transport-4.1.43.Final.jar:4.1.43.Final]at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360) [netty-transport-4.1.43.Final.jar:4.1.43.Final]at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352) [netty-transport-4.1.43.Final.jar:4.1.43.Final]at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:326) [netty-codec-4.1.43.Final.jar:4.1.43.Final]at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:300) [netty-codec-4.1.43.Final.jar:4.1.43.Final]at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374) [netty-transport-4.1.43.Final.jar:4.1.43.Final]at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360) [netty-transport-4.1.43.Final.jar:4.1.43.Final]at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352) [netty-transport-4.1.43.Final.jar:4.1.43.Final]at io.netty.handler.logging.LoggingHandler.channelRead(LoggingHandler.java:241) [netty-handler-4.1.43.Final.jar:4.1.43.Final]at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374) [netty-transport-4.1.43.Final.jar:4.1.43.Final]at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360) [netty-transport-4.1.43.Final.jar:4.1.43.Final]at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352) [netty-transport-4.1.43.Final.jar:4.1.43.Final]at io.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:1478) [netty-handler-4.1.43.Final.jar:4.1.43.Final]at io.netty.handler.ssl.SslHandler.decodeJdkCompatible(SslHandler.java:1227) [netty-handler-4.1.43.Final.jar:4.1.43.Final]at io.netty.handler.ssl.SslHandler.decode(SslHandler.java:1274) [netty-handler-4.1.43.Final.jar:4.1.43.Final]at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:503) [netty-codec-4.1.43.Final.jar:4.1.43.Final]at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:442) [netty-codec-4.1.43.Final.jar:4.1.43.Final]at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:281) [netty-codec-4.1.43.Final.jar:4.1.43.Final]at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374) [netty-transport-4.1.43.Final.jar:4.1.43.Final]at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360) [netty-transport-4.1.43.Final.jar:4.1.43.Final]at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352) [netty-transport-4.1.43.Final.jar:4.1.43.Final]at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1422) [netty-transport-4.1.43.Final.jar:4.1.43.Final]at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374) [netty-transport-4.1.43.Final.jar:4.1.43.Final]at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360) [netty-transport-4.1.43.Final.jar:4.1.43.Final]at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:931) [netty-transport-4.1.43.Final.jar:4.1.43.Final]at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163) [netty-transport-4.1.43.Final.jar:4.1.43.Final]at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:700) [netty-transport-4.1.43.Final.jar:4.1.43.Final]at io.netty.channel.nio.NioEventLoop.processSelectedKeysPlain(NioEventLoop.java:600) [netty-transport-4.1.43.Final.jar:4.1.43.Final]at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:554) [netty-transport-4.1.43.Final.jar:4.1.43.Final]at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:514) [netty-transport-4.1.43.Final.jar:4.1.43.Final]at io.netty.util.concurrent.SingleThreadEventExecutor$6.run(SingleThreadEventExecutor.java:1050) [netty-common-4.1.43.Final.jar:4.1.43.Final]at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) [netty-common-4.1.43.Final.jar:4.1.43.Final]at java.lang.Thread.run(Thread.java:830) [?:?]查资料说是连接数超出了elasticsearch等待队列的长度1000(默认设置，官方强烈建议不要修改)，集群状态依然是绿色，但已经不再接受客户端请求(http服务类的程序一般会有三个线程池，等待、监听和处理线程池，无论是tomcat、jetty，当然elasticsearch也不例外，当等待请求超过等待队列的线程上限时，就直接返回超时)重启后隔一段时间后问题依旧# 通过netstat查看连接数，除了集群之间的连接外，发现一个IP产生大量连接
# 命令如下
# netstat -tanop|grep ESTABLISHED|grep 1.1.1.1 |wc -l
812# iftop 观察数据流 发现是公司内部的一个爬虫程序不停的向集群写入数据，流量很大在 5~20M之间，停用这个程序后发现问题依旧，于是重启集群，并且将该IP拉入9200端口黑名单，问题暂时解决# 修改密码后的测试，简单搜索# curl -u elastic:pass http://10.10.17.21:9200/_search?pretty# 简单的搜索测试
curl -XGET "http://elastic:pass@10.10.17.21:9200/channel_youtube/_search?pretty" -H 'Content-Type: application/json' -d '
{"query":{"term":{"channel_id":"UCcanbycIDH5RClqwfpcSNmA"}}
}
'