**Build scan:**
https://gradle-enterprise.elastic.co/s/zyhrlysfsadi4/tests/:x-pack:plugin:deprecation:qa:rest:javaRestTest/org.elasticsearch.xpack.deprecation.DeprecationHttpIT/testCompatibleMessagesCanBeIndexed

**Reproduction line:**
```
./gradlew ':x-pack:plugin:deprecation:qa:rest:javaRestTest' --tests "org.elasticsearch.xpack.deprecation.DeprecationHttpIT.testCompatibleMessagesCanBeIndexed" -Dtests.seed=4C1CAF7BECF2A015 -Dtests.locale=no -Dtests.timezone=Asia/Kolkata -Druntime.java=20
```

**Applicable branches:**
8.8

**Reproduces locally?:**
No

**Failure history:**
https://gradle-enterprise.elastic.co/scans/tests?tests.container=org.elasticsearch.xpack.deprecation.DeprecationHttpIT&tests.test=testCompatibleMessagesCanBeIndexed

**Failure excerpt:**
```
java.lang.AssertionError: 
Expected: a collection with size <2>
     but: collection size was <4>

  at __randomizedtesting.SeedInfo.seed([4C1CAF7BECF2A015:F77AD8047494D1C4]: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.deprecation.DeprecationHttpIT.lambda$testCompatibleMessagesCanBeIndexed$13(DeprecationHttpIT.java:614)
  at org.elasticsearch.test.ESTestCase.assertBusy(ESTestCase.java:1158)
  at org.elasticsearch.xpack.deprecation.DeprecationHttpIT.testCompatibleMessagesCanBeIndexed(DeprecationHttpIT.java:610)
  at jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
  at java.lang.reflect.Method.invoke(Method.java:578)
  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:48)
  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:1623)

```
x-pack/plugin/deprecation/qa/rest/src/javaRestTest/java/org/elasticsearch/xpack/deprecation/DeprecationHttpIT.java
hasEntry(KEY_FIELD_NAME, "deprecated_route_GET_/_test_cluster/deprecated_settings"),
                        hasEntry("event.dataset", "deprecation.elasticsearch"),
                        hasEntry("log.level", "WARN"),
                        hasKey("log.logger"),
                        hasEntry("message", "[/_test_cluster/deprecated_settings] exists for deprecated tests")
                    )
                )
            );
        }, 30, TimeUnit.SECONDS);
    }
    /**
     * Check that log messages about REST API compatibility are recorded to an index
     */
    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/96723")
    public void testCompatibleMessagesCanBeIndexed() throws Exception {
        final Request compatibleRequest = new Request("GET", "/_test_cluster/compat_only");
        final RequestOptions compatibleOptions = compatibleRequest.getOptions()
            .toBuilder()
            .addHeader("X-Opaque-Id", "xOpaqueId-testCompatibleMessagesCanBeIndexed")
            .addHeader("Accept", "application/vnd.elasticsearch+json;compatible-with=" + RestApiVersion.minimumSupported().major)
            .addHeader("Content-Type", "application/vnd.elasticsearch+json;compatible-with=" + RestApiVersion.minimumSupported().major)
            .build();
        compatibleRequest.setOptions(compatibleOptions);
        compatibleRequest.setEntity(
            buildSettingsRequest(
                Collections.singletonList(TestDeprecationHeaderRestAction.TEST_DEPRECATED_SETTING_TRUE1),
                "deprecated_settings"
            )
        );
        Response deprecatedApiResponse = client().performRequest(compatibleRequest);