**Build scan:**
https://gradle-enterprise.elastic.co/s/aodpvg6m2oba4/tests/:x-pack:plugin:ilm:internalClusterTest/org.elasticsearch.xpack.ilm.DataTiersMigrationsTests/testUserOptsOutOfTierMigration

**Reproduction line:**
`./gradlew ':x-pack:plugin:ilm:internalClusterTest' --tests "org.elasticsearch.xpack.ilm.DataTiersMigrationsTests.testUserOptsOutOfTierMigration" -Dtests.seed=D3FF350541188AFA -Dtests.locale=ar-IQ -Dtests.timezone=Asia/Famagusta -Druntime.java=18`

**Applicable branches:**
8.1

**Reproduces locally?:**
No

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

**Failure excerpt:**
```
java.lang.AssertionError: 
Expected: is "warm"
     but: was "new"

  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.ilm.DataTiersMigrationsTests.lambda$testUserOptsOutOfTierMigration$3(DataTiersMigrationsTests.java:192)
  at org.elasticsearch.test.ESTestCase.assertBusy(ESTestCase.java:1070)
  at org.elasticsearch.xpack.ilm.DataTiersMigrationsTests.testUserOptsOutOfTierMigration(DataTiersMigrationsTests.java:187)
  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.util.TestRuleSetupTeardownChained$1.evaluate(TestRuleSetupTeardownChained.java:44)
  at org.apache.lucene.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:43)
  at org.apache.lucene.util.TestRuleThreadAndTestName$1.evaluate(TestRuleThreadAndTestName.java:45)
  at org.apache.lucene.util.TestRuleIgnoreAfterMaxFailures$1.evaluate(TestRuleIgnoreAfterMaxFailures.java:60)
  at org.apache.lucene.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:375)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl.forkTimeoutingTask(ThreadLeakControl.java:824)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl$3.evaluate(ThreadLeakControl.java:475)
  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.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:43)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at org.apache.lucene.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.util.TestRuleAssertionsRequired$1.evaluate(TestRuleAssertionsRequired.java:53)
  at org.apache.lucene.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:43)
  at org.apache.lucene.util.TestRuleMarkFailure$1.evaluate(TestRuleMarkFailure.java:44)
  at org.apache.lucene.util.TestRuleIgnoreAfterMaxFailures$1.evaluate(TestRuleIgnoreAfterMaxFailures.java:60)
  at org.apache.lucene.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:375)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl.lambda$forkTimeoutingTask$0(ThreadLeakControl.java:831)
  at java.lang.Thread.run(Thread.java:833)

```
x-pack/plugin/ilm/src/main/java/org/elasticsearch/xpack/ilm/PolicyStepsRegistry.java
throw new UnsupportedOperationException("should never be called");
                }
            }
        );
        for (String deletedPolicyName : mapDiff.getDeletes()) {
            lifecyclePolicyMap.remove(deletedPolicyName);
            firstStepMap.remove(deletedPolicyName);
            stepMap.remove(deletedPolicyName);
        }
        if (mapDiff.getUpserts().isEmpty() == false) {
            for (LifecyclePolicyMetadata policyMetadata : mapDiff.getUpserts().values()) {
                LifecyclePolicySecurityClient policyClient = new LifecyclePolicySecurityClient(
                    client,
                    ClientHelper.INDEX_LIFECYCLE_ORIGIN,
                    policyMetadata.getHeaders()
                );
                lifecyclePolicyMap.put(policyMetadata.getName(), policyMetadata);
                List<Step> policyAsSteps = policyMetadata.getPolicy().toSteps(policyClient, licenseState);
                if (policyAsSteps.isEmpty() == false) {
                    firstStepMap.put(policyMetadata.getName(), policyAsSteps.get(0));
                    final Map<Step.StepKey, Step> stepMapForPolicy = new LinkedHashMap<>();
                    for (Step step : policyAsSteps) {
                        assert ErrorStep.NAME.equals(step.getKey().getName()) == false : "unexpected error step in policy";
                        stepMapForPolicy.put(step.getKey(), step);
                    }
                    logger.trace(
                        "updating cached steps for [{}] policy, new steps: {}",
                        policyMetadata.getName(),
                        stepMapForPolicy.keySet()