Failed twice in the last week, and is locally reproducible.

**Build scan:**
https://gradle-enterprise.elastic.co/s/dxnvprlmuv4sc/tests/:x-pack:plugin:core:test/org.elasticsearch.xpack.core.ilm.RollupStepTests/testHashcodeAndEquals

**Reproduction line:**
`./gradlew ':x-pack:plugin:core:test' --tests "org.elasticsearch.xpack.core.ilm.RollupStepTests.testHashcodeAndEquals" -Dtests.seed=472408AA59F51470 -Dtests.locale=bg-BG -Dtests.timezone=Asia/Amman -Druntime.java=17`

**Applicable branches:**
main

**Reproduces locally?:**
Yes

**Failure history:**
https://gradle-enterprise.elastic.co/scans/tests?tests.container=org.elasticsearch.xpack.core.ilm.RollupStepTests&tests.test=testHashcodeAndEquals

**Failure excerpt:**
```
java.lang.AssertionError: RollupStep mutation should not be equal to original
Expected: not <{"phase":"TyGzhjRxSa","action":"RWOGPFpEKC","name":"HcjYChpiDX"} => {"phase":"ZkKYzfAFWh","action":"voUftYVNmR","name":"QXxqKuiwlm"}>
     but: was <{"phase":"TyGzhjRxSa","action":"RWOGPFpEKC","name":"HcjYChpiDX"} => {"phase":"ZkKYzfAFWh","action":"voUftYVNmR","name":"QXxqKuiwlm"}>

  at __randomizedtesting.SeedInfo.seed([472408AA59F51470:1B5D3FE52FEB8364]:0)
  at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:18)
  at org.junit.Assert.assertThat(Assert.java:956)
  at org.elasticsearch.test.EqualsHashCodeTestUtils.checkEqualsAndHashCode(EqualsHashCodeTestUtils.java:73)
  at org.elasticsearch.xpack.core.ilm.AbstractStepTestCase.testHashcodeAndEquals(AbstractStepTestCase.java:52)
  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/core/src/test/java/org/elasticsearch/xpack/core/ilm/RollupStepTests.java
@Override
            public void onFailure(Exception e) {
                fail("onFailure should not be called in this test, called with exception: " + e.getMessage());
            }
        });
    }
    /**
     * Test rollup step when an in-progress rollup index already exists.
     */
    public void testPerformActionRollupInProgressIndexExists() {
        String sourceIndexName = randomAlphaOfLength(10);
        String lifecycleName = randomAlphaOfLength(5);
        RollupStep step = createRandomInstance();
        LifecycleExecutionState.Builder lifecycleState = LifecycleExecutionState.builder();
        lifecycleState.setPhase(step.getKey().phase());
        lifecycleState.setAction(step.getKey().action());
        lifecycleState.setStep(step.getKey().name());
        lifecycleState.setIndexCreationDate(randomNonNegativeLong());
        String rollupIndex = GenerateUniqueIndexNameStep.generateValidIndexName(DOWNSAMPLED_INDEX_PREFIX, sourceIndexName);
        lifecycleState.setRollupIndexName(rollupIndex);
        IndexMetadata sourceIndexMetadata = IndexMetadata.builder(sourceIndexName)
            .settings(settings(Version.CURRENT).put(LifecycleSettings.LIFECYCLE_NAME, lifecycleName))
            .putCustom(ILM_CUSTOM_METADATA_KEY, lifecycleState.build().asMap())
            .numberOfShards(randomIntBetween(1, 5))
            .numberOfReplicas(randomIntBetween(0, 5))
            .build();
        
        IndexMetadata indexMetadata = IndexMetadata.builder(rollupIndex)
            .settings(
                settings(Version.CURRENT).put(IndexMetadata.INDEX_DOWNSAMPLE_STATUS.getKey(), IndexMetadata.DownsampleTaskStatus.STARTED)