ES的java接口调用异常信息：java.lang.RuntimeException: Request cannot be executed； I/O reactor status: STOPPED

一、异常信息

java.lang.RuntimeException: Request cannot be executed; I/O reactor status: STOPPED
        at org.elasticsearch.client.RestClient.extractAndWrapCause(RestClient.java:796)
        at org.elasticsearch.client.RestClient.performRequest(RestClient.java:218)
        at org.elasticsearch.client.RestClient.performRequest(RestClient.java:205)
        at org.elasticsearch.client.RestHighLevelClient.internalPerformRequest(RestHighLevelClient.java:1454)
        at org.elasticsearch.client.RestHighLevelClient.performRequest(RestHighLevelClient.java:1424)
        at org.elasticsearch.client.RestHighLevelClient.performRequestAndParseEntity(RestHighLevelClient.java:1394)
        at org.elasticsearch.client.RestHighLevelClient.search(RestHighLevelClient.java:930)
        at com.sitech.cmap.schedule.app.ElkSyncAppImpl.collectElkData(ElkSyncAppImpl.java:1326)
        at com.sitech.cmap.schedule.app.ElkSyncAppImpl.lambda$perSync$0(ElkSyncAppImpl.java:104)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
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:214)
        ... 10 more

二、可能问题

1. 远程服务已经停止运行，无法提供服务；
2. 使用多线程调用远程服务，远程服务无法满足请求量，导致异常抛出；解决方法：1）提高远程服务能力；2）降低并发请求；