**Build scan:**
https://gradle-enterprise.elastic.co/s/pj3fkjxw6w4yy/tests/:server:test/org.elasticsearch.reservedstate.service.FileSettingsServiceTests/testCallsProcessing

**Reproduction line:**
`gradlew ':server:test' --tests "org.elasticsearch.reservedstate.service.FileSettingsServiceTests.testCallsProcessing" -Dtests.seed=40DA87BCC9A63932 -Dtests.locale=sv -Dtests.timezone=Asia/Macau -Druntime.java=18`

**Applicable branches:**
main

**Reproduces locally?:**
No

**Failure history:**
https://gradle-enterprise.elastic.co/scans/tests?tests.container=org.elasticsearch.reservedstate.service.FileSettingsServiceTests&tests.test=testCallsProcessing

**Failure excerpt:**
```
org.mockito.exceptions.verification.TooManyActualInvocations: 
fileSettingsService.processFileSettings(
    <any>
);
Wanted 1 time:
-> at org.elasticsearch.reservedstate.service.FileSettingsServiceTests.testCallsProcessing(FileSettingsServiceTests.java:217)
But was 2 times:
-> at org.elasticsearch.reservedstate.service.FileSettingsService.watcherThread(FileSettingsService.java:324)
-> at org.elasticsearch.reservedstate.service.FileSettingsService.watcherThread(FileSettingsService.java:324)


  at __randomizedtesting.SeedInfo.seed([40DA87BCC9A63932:43A21E4AEAEC78EE]:0)
  at org.elasticsearch.reservedstate.service.FileSettingsServiceTests.testCallsProcessing(FileSettingsServiceTests.java:217)
  at jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
  at java.lang.reflect.Method.invoke(Method.java:577)
  at com.carrotsearch.randomizedtesting.RandomizedRunner.invoke(RandomizedRunner.java:1758)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$8.evaluate(RandomizedRunner.java:946)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$9.evaluate(RandomizedRunner.java:982)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$10.evaluate(RandomizedRunner.java:996)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at org.apache.lucene.tests.util.TestRuleSetupTeardownChained$1.evaluate(TestRuleSetupTeardownChained.java:44)
  at org.apache.lucene.tests.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:43)
  at org.apache.lucene.tests.util.TestRuleThreadAndTestName$1.evaluate(TestRuleThreadAndTestName.java:45)
  at org.apache.lucene.tests.util.TestRuleIgnoreAfterMaxFailures$1.evaluate(TestRuleIgnoreAfterMaxFailures.java:60)
  at org.apache.lucene.tests.util.TestRuleMarkFailure$1.evaluate(TestRuleMarkFailure.java:44)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl$StatementRunner.run(ThreadLeakControl.java:390)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl.forkTimeoutingTask(ThreadLeakControl.java:843)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl$3.evaluate(ThreadLeakControl.java:490)
  at com.carrotsearch.randomizedtesting.RandomizedRunner.runSingleTest(RandomizedRunner.java:955)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$5.evaluate(RandomizedRunner.java:840)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$6.evaluate(RandomizedRunner.java:891)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$7.evaluate(RandomizedRunner.java:902)
  at org.apache.lucene.tests.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:43)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at org.apache.lucene.tests.util.TestRuleStoreClassName$1.evaluate(TestRuleStoreClassName.java:38)
  at com.carrotsearch.randomizedtesting.rules.NoShadowingOrOverridesOnMethodsRule$1.evaluate(NoShadowingOrOverridesOnMethodsRule.java:40)
  at com.carrotsearch.randomizedtesting.rules.NoShadowingOrOverridesOnMethodsRule$1.evaluate(NoShadowingOrOverridesOnMethodsRule.java:40)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at org.apache.lucene.tests.util.TestRuleAssertionsRequired$1.evaluate(TestRuleAssertionsRequired.java:53)
  at org.apache.lucene.tests.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:43)
  at org.apache.lucene.tests.util.TestRuleMarkFailure$1.evaluate(TestRuleMarkFailure.java:44)
  at org.apache.lucene.tests.util.TestRuleIgnoreAfterMaxFailures$1.evaluate(TestRuleIgnoreAfterMaxFailures.java:60)
  at org.apache.lucene.tests.util.TestRuleIgnoreTestSuites$1.evaluate(TestRuleIgnoreTestSuites.java:47)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl$StatementRunner.run(ThreadLeakControl.java:390)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl.lambda$forkTimeoutingTask$0(ThreadLeakControl.java:850)
  at java.lang.Thread.run(Thread.java:833)

```
server/src/test/java/org/elasticsearch/reservedstate/service/FileSettingsServiceTests.java
assertTrue(processFileLatch.await(30, TimeUnit.SECONDS));
        
        service.stop();
        assertFalse(service.watching());
        service.close();
        
        deadThreadLatch.countDown();
    }
    @SuppressWarnings("unchecked")
    public void testNodeInfosRefresh() throws Exception {
        var spiedController = spy(controller);
        var csAdminClient = spy(clusterAdminClient);
        var response = new NodesInfoResponse(new ClusterName("elasticsearch"), List.of(nodeInfo), List.of());
        doAnswer(i -> {
            ((ActionListener<NodesInfoResponse>) i.getArgument(1)).onResponse(response);
            return null;
        }).when(csAdminClient).nodesInfo(any(), any());
        var service = spy(new FileSettingsService(clusterService, spiedController, env, nodeClient));
        doAnswer(i -> csAdminClient).when(service).clusterAdminClient();
        doAnswer(
            (Answer<ReservedStateChunk>) invocation -> new ReservedStateChunk(
                Collections.emptyMap(),
                new ReservedStateVersion(1L, Version.CURRENT)
            )
        ).when(spiedController).parse(any(String.class), any());
        Files.createDirectories(service.operatorSettingsDir());
        
        Files.write(service.operatorSettingsFile(), "{}".getBytes(StandardCharsets.UTF_8));