MULTIPLE PATCH CSV FILE CancellationException

We are running 40jobs in parallel reading the message from azure queue, compute then using a Feign client to PATCH a CSV file with 700 lines each. After 30 min, we start to see Http connection cancelations in the pool. No http patch message is sent in those threads (at least they don't appear in logs: Dependencies: implementation 'org.springframework.cloud:spring-cloud-starter-openfeign:4.1.3' implementation 'io.github.openfeign:feign-hc5:12.4'

at com.azure.messaging.servicebus.MessagePump.notifyMessage(MessagePump.java:157) at com.azure.messaging.servicebus.MessagePump.lambda$handleMessage$3(MessagePump.java:142) at com.azure.messaging.servicebus.implementation.instrumentation.ServiceBusReceiverInstrumentation.wrap(ServiceBusReceiverInstrumentation.java:169) at com.azure.messaging.servicebus.implementation.instrumentation.ServiceBusReceiverInstrumentation.instrumentProcess(ServiceBusReceiverInstrumentation.java:104) at com.azure.messaging.servicebus.MessagePump.handleMessage(MessagePump.java:135) at com.azure.messaging.servicebus.MessagePump$RunOnWorker.lambda$apply$0(MessagePump.java:212) at reactor.core.publisher.MonoRunnable.call(MonoRunnable.java:73) at reactor.core.publisher.MonoRunnable.call(MonoRunnable.java:32) at reactor.core.publisher.FluxSubscribeOnCallable$CallableSubscribeOnSubscription.run(FluxSubscribeOnCallable.java:228) at reactor.core.scheduler.SchedulerTask.call(SchedulerTask.java:68) at reactor.core.scheduler.SchedulerTask.call(SchedulerTask.java:28) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) at java.base/java.lang.Thread.run(Thread.java:833) Caused by: java.util.concurrent.CancellationException: null at org.apache.hc.core5.concurrent.BasicFuture.getResult(BasicFuture.java:75) at org.apache.hc.core5.concurrent.BasicFuture.get(BasicFuture.java:96) at org.apache.hc.core5.pool.StrictConnPool$1.get(StrictConnPool.java:184) at org.apache.hc.core5.pool.StrictConnPool$1.get(StrictConnPool.java:178) at org.apache.hc.client5.http.impl.io.PoolingHttpClientConnectionManager$3.get(PoolingHttpClientConnectionManager.java:311) at org.apache.hc.client5.http.impl.classic.InternalExecRuntime.acquireEndpoint(InternalExecRuntime.java:109) at org.apache.hc.client5.http.impl.classic.ConnectExec.execute(ConnectExec.java:125) at org.apache.hc.client5.http.impl.classic.ExecChainElement.execute(ExecChainElement.java:51) at org.apache.hc.client5.http.impl.classic.ProtocolExec.execute(ProtocolExec.java:192) at org.apache.hc.client5.http.impl.classic.ExecChainElement.execute(ExecChainElement.java:51) at org.apache.hc.client5.http.impl.classic.HttpRequestRetryExec.execute(HttpRequestRetryExec.java:113) at org.apache.hc.client5.http.impl.classic.ExecChainElement.execute(ExecChainElement.java:51) at org.apache.hc.client5.http.impl.classic.ContentCompressionExec.execute(ContentCompressionExec.java:152) at org.apache.hc.client5.http.impl.classic.ExecChainElement.execute(ExecChainElement.java:51) at org.apache.hc.client5.http.impl.classic.RedirectExec.execute(RedirectExec.java:116) at org.apache.hc.client5.http.impl.classic.ExecChainElement.execute(ExecChainElement.java:51) at org.apache.hc.client5.http.impl.classic.InternalHttpClient.doExecute(InternalHttpClient.java:170) at org.apache.hc.client5.http.impl.classic.CloseableHttpClient.execute(CloseableHttpClient.java:87) at org.apache.hc.client5.http.impl.classic.CloseableHttpClient.execute(CloseableHttpClient.java:55) at feign.hc5.ApacheHttp5Client.execute(ApacheHttp5Client.java:88)

What could be the reason?