Elasticsearch7SinkITCase.testWriteJsonToElasticsearch fails with socket timeout

Feb 18 18:04:20 [ERROR] Tests run: 6, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 80.248 s <<< FAILURE! - in org.apache.flink.connector.elasticsearch.sink.Elasticsearch7SinkITCase
Feb 18 18:04:20 [ERROR] org.apache.flink.connector.elasticsearch.sink.Elasticsearch7SinkITCase.testWriteJsonToElasticsearch(BiFunction)[1]  Time elapsed: 31.525 s  <<< ERROR!
Feb 18 18:04:20 org.apache.flink.runtime.client.JobExecutionException: Job execution failed.
Feb 18 18:04:20 	at org.apache.flink.runtime.jobmaster.JobResult.toJobExecutionResult(JobResult.java:144)
Feb 18 18:04:20 	at org.apache.flink.runtime.minicluster.MiniClusterJobClient.lambda$getJobExecutionResult$3(MiniClusterJobClient.java:141)
Feb 18 18:04:20 	at java.util.concurrent.CompletableFuture.uniApply(CompletableFuture.java:616)
Feb 18 18:04:20 	at java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:591)
Feb 18 18:04:20 	at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:488)
Feb 18 18:04:20 	at java.util.concurrent.CompletableFuture.complete(CompletableFuture.java:1975)
Feb 18 18:04:20 	at org.apache.flink.runtime.rpc.akka.AkkaInvocationHandler.lambda$invokeRpc$1(AkkaInvocationHandler.java:259)
Feb 18 18:04:20 	at java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:774)
Feb 18 18:04:20 	at java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(CompletableFuture.java:750)
Feb 18 18:04:20 	at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:488)
Feb 18 18:04:20 	at java.util.concurrent.CompletableFuture.complete(CompletableFuture.java:1975)
Feb 18 18:04:20 	at org.apache.flink.util.concurrent.FutureUtils.doForward(FutureUtils.java:1389)
Feb 18 18:04:20 	at org.apache.flink.runtime.concurrent.akka.ClassLoadingUtils.lambda$null$1(ClassLoadingUtils.java:93)
Feb 18 18:04:20 	at org.apache.flink.runtime.concurrent.akka.ClassLoadingUtils.runWithContextClassLoader(ClassLoadingUtils.java:68)
Feb 18 18:04:20 	at org.apache.flink.runtime.concurrent.akka.ClassLoadingUtils.lambda$guardCompletionWithContextClassLoader$2(ClassLoadingUtils.java:92)
Feb 18 18:04:20 	at java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:774)
Feb 18 18:04:20 	at java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(CompletableFuture.java:750)
Feb 18 18:04:20 	at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:488)
Feb 18 18:04:20 	at java.util.concurrent.CompletableFuture.complete(CompletableFuture.java:1975)
Feb 18 18:04:20 	at org.apache.flink.runtime.concurrent.akka.AkkaFutureUtils$1.onComplete(AkkaFutureUtils.java:47)
Feb 18 18:04:20 	at akka.dispatch.OnComplete.internal(Future.scala:300)
Feb 18 18:04:20 	at akka.dispatch.OnComplete.internal(Future.scala:297)
Feb 18 18:04:20 	at akka.dispatch.japi$CallbackBridge.apply(Future.scala:224)
Feb 18 18:04:20 	at akka.dispatch.japi$CallbackBridge.apply(Future.scala:221)
Feb 18 18:04:20 	at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:60)
Feb 18 18:04:20 	at org.apache.flink.runtime.concurrent.akka.AkkaFutureUtils$DirectExecutionContext.execute(AkkaFutureUtils.java:65)
Feb 18 18:04:20 	at scala.concurrent.impl.CallbackRunnable.executeWithValue(Promise.scala:68)
[...]
at org.apache.flink.streaming.runtime.tasks.StreamTask.performCheckpoint(StreamTask.java:1241)
Feb 18 18:04:20 	at org.apache.flink.streaming.runtime.tasks.StreamTask.triggerCheckpointAsyncInMailbox(StreamTask.java:1126)
Feb 18 18:04:20 	... 13 more
Feb 18 18:04:20 Caused by: java.net.SocketTimeoutException: 30,000 milliseconds timeout on connection http-outgoing-3 [ACTIVE]
Feb 18 18:04:20 	at org.apache.http.nio.protocol.HttpAsyncRequestExecutor.timeout(HttpAsyncRequestExecutor.java:387)
Feb 18 18:04:20 	at org.apache.http.impl.nio.client.InternalIODispatch.onTimeout(InternalIODispatch.java:92)
Feb 18 18:04:20 	at org.apache.http.impl.nio.client.InternalIODispatch.onTimeout(InternalIODispatch.java:39)
Feb 18 18:04:20 	at org.apache.http.impl.nio.reactor.AbstractIODispatch.timeout(AbstractIODispatch.java:175)
Feb 18 18:04:20 	at org.apache.http.impl.nio.reactor.BaseIOReactor.sessionTimedOut(BaseIOReactor.java:261)
Feb 18 18:04:20 	at org.apache.http.impl.nio.reactor.AbstractIOReactor.timeoutCheck(AbstractIOReactor.java:502)
Feb 18 18:04:20 	at org.apache.http.impl.nio.reactor.BaseIOReactor.validate(BaseIOReactor.java:211)
Feb 18 18:04:20 	at org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor.java:280)
Feb 18 18:04:20 	at org.apache.http.impl.nio.reactor.BaseIOReactor.execute(BaseIOReactor.java:104)
Feb 18 18:04:20 	at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor$Worker.run(AbstractMultiworkerIOReactor.java:591)
Feb 18 18:04:20 	... 1 more