**Build scan:**
https://gradle-enterprise.elastic.co/s/oownftesgpjga/tests/:server:test/org.elasticsearch.cluster.metadata.DataStreamTests/testEqualsAndHashcode

**Reproduction line:**
```
./gradlew ':server:test' --tests "org.elasticsearch.cluster.metadata.DataStreamTests.testEqualsAndHashcode" -Dtests.seed=4654A6F5E2BFE5DB -Dtests.locale=ar-AE -Dtests.timezone=Africa/Nairobi -Druntime.java=17
```

**Applicable branches:**
main

**Reproduces locally?:**
Yes

**Failure history:**
https://gradle-enterprise.elastic.co/scans/tests?tests.container=org.elasticsearch.cluster.metadata.DataStreamTests&tests.test=testEqualsAndHashcode

**Failure excerpt:**
```
java.lang.AssertionError: (No message provided)

  at __randomizedtesting.SeedInfo.seed([4654A6F5E2BFE5DB:375BDE382D58ACF4]:0)
  at org.elasticsearch.cluster.metadata.DataStream.assertConsistent(DataStream.java:160)
  at org.elasticsearch.cluster.metadata.DataStream.<init>(DataStream.java:141)
  at org.elasticsearch.cluster.metadata.DataStream.<init>(DataStream.java:100)
  at org.elasticsearch.cluster.metadata.DataStreamTests.mutateInstance(DataStreamTests.java:103)
  at org.elasticsearch.cluster.metadata.DataStreamTests.mutateInstance(DataStreamTests.java:45)
  at org.elasticsearch.test.EqualsHashCodeTestUtils.checkEqualsAndHashCode(EqualsHashCodeTestUtils.java:72)
  at org.elasticsearch.test.AbstractWireTestCase.testEqualsAndHashcode(AbstractWireTestCase.java:57)
  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: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:833)

```
server/src/test/java/org/elasticsearch/cluster/metadata/DataStreamTests.java
for (int i = 1; i <= numBackingIndices; i++) {
            indices.add(new Index(DataStream.getDefaultBackingIndexName(dataStreamName, i), UUIDs.randomBase64UUID(random())));
        }
        int generation = randomBoolean() ? numBackingIndices : numBackingIndices + randomIntBetween(1, 5);
        DataStream original = newInstance(dataStreamName, indices, generation, null);
        Index newBackingIndex = new Index("replacement-index", UUIDs.randomBase64UUID(random()));
        IllegalArgumentException e = expectThrows(
            IllegalArgumentException.class,
            () -> original.replaceBackingIndex(indices.get(writeIndexPosition), newBackingIndex)
        );
        assertThat(
            e.getMessage(),
            equalTo(
                String.format(
                    Locale.ROOT,
                    "cannot replace backing index [%s] of data stream [%s] because it is the write index",
                    indices.get(writeIndexPosition).getName(),
                    dataStreamName
                )
            )
        );
    }
    public void testSnapshot() {
        var preSnapshotDataStream = DataStreamTestHelper.randomInstance();
        var indicesToRemove = randomSubsetOf(preSnapshotDataStream.getIndices());
        if (indicesToRemove.size() == preSnapshotDataStream.getIndices().size()) {
            
            indicesToRemove.remove(0);
        }
        var indicesToAdd = DataStreamTestHelper.randomIndexInstances();