【ElasticSearch】异常 Request cannot be executed; I/O reactor status: STOPPED

Caused by: java.lang.RuntimeException: Request cannot be executed; I/O reactor status: STOPPED
    at org.elasticsearch.client.RestClient.extractAndWrapCause(RestClient.java:857)
    at org.elasticsearch.client.RestClient.performRequest(RestClient.java:259)
    at org.elasticsearch.client.RestClient.performRequest(RestClient.java:246)
    at org.elasticsearch.client.RestHighLevelClient.internalPerformRequest(RestHighLevelClient.java:1613)
    at org.elasticsearch.client.RestHighLevelClient.performRequest(RestHighLevelClient.java:1583)
    at org.elasticsearch.client.RestHighLevelClient.performRequestAndParseEntity(RestHighLevelClient.java:1553)
    at org.elasticsearch.client.RestHighLevelClient.search(RestHighLevelClient.java:1069)
    at com.deyatech.esutil.service.impl.ElasticSearchServiceImpl.selectDataByESQueryJSON(ElasticSearchServiceImpl.java:581)
    at com.deyatech.esutil.service.impl.ElasticSearchServiceImpl.searchData(ElasticSearchServiceImpl.java:548)
    at com.deyatech.reception.service.impl.InfoTemplateEsServiceImpl.getElaticsearchResult(InfoTemplateEsServiceImpl.java:251)
    at com.deyatech.reception.service.impl.InfoTemplateEsServiceImpl.getTemplateListView(InfoTemplateEsServiceImpl.java:120)
    at com.deyatech.reception.service.impl.InfoTemplateServiceImpl.getTemplateListView(InfoTemplateServiceImpl.java:221)
    at com.deyatech.reception.service.impl.InfoTemplateServiceImpl$$FastClassBySpringCGLIB$$aadf779.invoke(<generated>)
    at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:771)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749)
    at org.springframework.cache.interceptor.CacheInterceptor.lambda$invoke$0(CacheInterceptor.java:53)
    at org.springframework.cache.interceptor.CacheAspectSupport.invokeOperation(CacheAspectSupport.java:366)
    at org.springframework.cache.interceptor.CacheAspectSupport.execute(CacheAspectSupport.java:421)
    at org.springframework.cache.interceptor.CacheAspectSupport.execute(CacheAspectSupport.java:346)
    at org.springframework.cache.interceptor.CacheInterceptor.invoke(CacheInterceptor.java:61)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749)
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:691)
    at com.deyatech.reception.service.impl.InfoTemplateServiceImpl$$EnhancerBySpringCGLIB$$6d755bd7.getTemplateListView(<generated>)
    at com.deyatech.reception.thymeleaf.InfoDataExpressionObject.getInfoList(InfoDataExpressionObject.java:47)
    at sun.reflect.GeneratedMethodAccessor1001.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at ognl.OgnlRuntime.invokeMethod(OgnlRuntime.java:902)
    at ognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:1547)
    ... 113 common frames omitted
Caused by: java.lang.IllegalStateException: Request cannot be executed; I/O reactor status: STOPPED
    at org.apache.http.util.Asserts.check(Asserts.java:46)
    at org.apache.http.impl.nio.client.CloseableHttpAsyncClientBase.ensureRunning(CloseableHttpAsyncClientBase.java:90)
    at org.apache.http.impl.nio.client.InternalHttpAsyncClient.execute(InternalHttpAsyncClient.java:123)
    at org.elasticsearch.client.RestClient.performRequest(RestClient.java:255)
    ... 143 common frames omitted

github已提的问题

https://github.com/elastic/elasticsearch/issues/42133

https://github.com/elastic/elasticsearch/issues/45115

https://github.com/elastic/elasticsearch/issues/49124

https://github.com/elastic/elasticsearch/issues/39946

一些可以尝试的方法来解决问题

1、After some debugging and configuration tuning, I found that the exception was caused by too many concurrent ElasticSearch clients. After I reduce the number of concurrent clients, the exception is gone.
减少客户端的数量，使用的地方都注入。

2、 I'm using the client at scheduled method, so every invocation is started in new thread. The client has been injected to the service and never closed. Seems that is the reason of exception in my case. I changed my implementation so a new client is created at every thread when it is needed and closes in the end of method. That fixed the issue.
每次使用都新创建客户端，用完后关闭。

3、自己构建 RestHighLevelClient 使用 HttpComponents，链接STOP时重新构造客户端