**Build scan:**
https://gradle-enterprise.elastic.co/s/swrn2vccdizu6/tests/:qa:smoke-test-http:javaRestTest/org.elasticsearch.http.ClusterStateRestCancellationIT/testClusterStateRestCancellation

**Reproduction line:**
`./gradlew ':qa:smoke-test-http:javaRestTest' --tests "org.elasticsearch.http.ClusterStateRestCancellationIT.testClusterStateRestCancellation" -Dtests.seed=2034D67B43AAFEF0 -Dtests.locale=ca -Dtests.timezone=Europe/Madrid -Druntime.java=17`

**Applicable branches:**
main

**Reproduces locally?:**
No

**Failure history:**
https://gradle-enterprise.elastic.co/scans/tests?tests.container=org.elasticsearch.http.ClusterStateRestCancellationIT&tests.test=testClusterStateRestCancellation

**Failure excerpt:**
```
java.lang.IllegalStateException: unable to launch a new watch service

  at __randomizedtesting.SeedInfo.seed([2034D67B43AAFEF0:A2A0FB19FD8E07BE]:0)
  at org.elasticsearch.reservedstate.service.FileSettingsService.startWatcher(FileSettingsService.java:271)
  at org.elasticsearch.reservedstate.service.FileSettingsService.startIfMaster(FileSettingsService.java:142)
  at org.elasticsearch.reservedstate.service.FileSettingsService.doStart(FileSettingsService.java:116)
  at org.elasticsearch.common.component.AbstractLifecycleComponent.start(AbstractLifecycleComponent.java:43)
  at org.elasticsearch.node.Node.start(Node.java:1372)
  at org.elasticsearch.test.InternalTestCluster$NodeAndClient.startNode(InternalTestCluster.java:982)
  at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539)
  at java.util.concurrent.FutureTask.run(FutureTask.java:264)
  at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingRunnable.run(ThreadContext.java:820)
  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
  at java.lang.Thread.run(Thread.java:833)

  Caused by: java.io.IOException: User limit of inotify watches reached

    at sun.nio.fs.LinuxWatchService$Poller.implRegister(LinuxWatchService.java:264)
    at sun.nio.fs.AbstractPoller.processRequests(AbstractPoller.java:266)
    at sun.nio.fs.LinuxWatchService$Poller.run(LinuxWatchService.java:364)
    at java.lang.Thread.run(Thread.java:833)

```
server/src/test/java/org/elasticsearch/reservedstate/service/FileSettingsServiceTests.java
/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the Elastic License
 * 2.0 and the Server Side Public License, v 1; you may not use this file except
 * in compliance with, at your election, the Elastic License 2.0 or the Server
 * Side Public License, v 1.
 */
package org.elasticsearch.reservedstate.service;
import org.elasticsearch.Build;
import org.elasticsearch.Version;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.admin.cluster.node.info.NodeInfo;
import org.elasticsearch.action.admin.cluster.node.info.NodesInfoResponse;
import org.elasticsearch.client.internal.ClusterAdminClient;
import org.elasticsearch.client.internal.node.NodeClient;
import org.elasticsearch.cluster.ClusterChangedEvent;
import org.elasticsearch.cluster.ClusterName;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.cluster.node.DiscoveryNodes;
import org.elasticsearch.cluster.routing.RerouteService;
import org.elasticsearch.cluster.service.ClusterService;
import org.elasticsearch.common.settings.ClusterSettings;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.env.Environment;
import org.elasticsearch.ingest.IngestInfo;
import org.elasticsearch.ingest.ProcessorInfo;
import org.elasticsearch.reservedstate.action.ReservedClusterSettingsAction;
import org.elasticsearch.test.ESTestCase;