**Build scan:**
https://gradle-enterprise.elastic.co/s/5g254tjz37xwo/tests/:x-pack:plugin:security:test/org.elasticsearch.xpack.security.authc.jwt.JwkSetLoaderTests/testConcurrentReloadWillBeQueuedAndShareTheResults

**Reproduction line:**
```
./gradlew ':x-pack:plugin:security:test' --tests "org.elasticsearch.xpack.security.authc.jwt.JwkSetLoaderTests.testConcurrentReloadWillBeQueuedAndShareTheResults" -Dtests.seed=1EF0077A5061E504 -Dtests.locale=id -Dtests.timezone=Africa/Dar_es_Salaam -Druntime.java=17
```

**Applicable branches:**
main

**Reproduces locally?:**
Didn't try

**Failure history:**
https://gradle-enterprise.elastic.co/scans/tests?tests.container=org.elasticsearch.xpack.security.authc.jwt.JwkSetLoaderTests&tests.test=testConcurrentReloadWillBeQueuedAndShareTheResults

**Failure excerpt:**
```
java.lang.AssertionError: 
Expected: sameInstance(<Tuple[v1=false, v2=JwksAlgs[jwks=[], algs=[]]]>)
     but: was <Tuple[v1=false, v2=JwksAlgs[jwks=[], algs=[]]]>

  at __randomizedtesting.SeedInfo.seed([1EF0077A5061E504:57606554A5F0FEA9]:0)
  at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:18)
  at org.junit.Assert.assertThat(Assert.java:956)
  at org.junit.Assert.assertThat(Assert.java:923)
  at org.elasticsearch.xpack.security.authc.jwt.JwkSetLoaderTests.lambda$testConcurrentReloadWillBeQueuedAndShareTheResults$4(JwkSetLoaderTests.java:71)
  at java.lang.Iterable.forEach(Iterable.java:75)
  at org.elasticsearch.xpack.security.authc.jwt.JwkSetLoaderTests.testConcurrentReloadWillBeQueuedAndShareTheResults(JwkSetLoaderTests.java:71)
  at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(NativeMethodAccessorImpl.java:-2)
  at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
  at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  at java.lang.reflect.Method.invoke(Method.java:568)
  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)

```
x-pack/plugin/security/src/test/java/org/elasticsearch/xpack/security/authc/jwt/JwkSetLoaderTests.java
Files.write(path, List.of("{\"keys\":[]}"), StandardCharsets.UTF_8);
        final RealmConfig realmConfig = mock(RealmConfig.class);
        when(realmConfig.getSetting(JwtRealmSettings.PKC_JWKSET_PATH)).thenReturn("jwkset.json");
        final Environment env = mock(Environment.class);
        when(env.configFile()).thenReturn(tempDir);
        when(realmConfig.env()).thenReturn(env);
        final JwkSetLoader jwkSetLoader = spy(new JwkSetLoader(realmConfig, List.of(), null));
        final int nThreads = randomIntBetween(2, 8);
        final var futures = IntStream.range(0, nThreads)
            .mapToObj(i -> new PlainActionFuture<Tuple<Boolean, JwkSetLoader.JwksAlgs>>())
            .toList();
        final var threadsCountDown = new CountDownLatch(nThreads);
        final var readyLatch = new CountDownLatch(1);
        doAnswer(invocation -> {
            
            threadsCountDown.countDown();
            
            assertThat(readyLatch.await(10, TimeUnit.SECONDS), is(true));
            return invocation.callRealMethod();
        }).when(jwkSetLoader).getFuture();
        
        IntStream.range(0, nThreads).forEach(i -> new Thread(() -> jwkSetLoader.reload(futures.get(i))).start());
        assertThat(threadsCountDown.await(10, TimeUnit.SECONDS), is(true));
        readyLatch.countDown();
        
        futures.forEach(future -> assertThat(future.actionGet(), sameInstance(futures.get(0).actionGet())));
        verify(jwkSetLoader, times(1)).loadInternal(anyActionListener());
    }
}