**Build scan:**
https://gradle-enterprise.elastic.co/s/kpoocm5rmmqv6/tests/:qa:full-cluster-restart:v7.2.0%23upgradedClusterTest/org.elasticsearch.upgrades.FullClusterRestartIT/testSystemIndexMetadataIsUpgraded

**Reproduction line:**
`./gradlew ':qa:full-cluster-restart:v7.2.0#upgradedClusterTest' -Dtests.class="org.elasticsearch.upgrades.FullClusterRestartIT" -Dtests.method="testSystemIndexMetadataIsUpgraded" -Dtests.seed=493EAE6B5BB5BDE4 -Dtests.bwc=true -Dtests.locale=es-EC -Dtests.timezone=Australia/West -Druntime.java=17`

**Applicable branches:**
master, 8.0

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

**Failure history:**
https://gradle-enterprise.elastic.co/scans/tests?tests.container=org.elasticsearch.upgrades.FullClusterRestartIT&tests.test=testSystemIndexMetadataIsUpgraded

**Failure excerpt:**
```
java.lang.AssertionError: 
Expected: is <true>
     but: was <false>

  at __randomizedtesting.SeedInfo.seed([493EAE6B5BB5BDE4:6AF039AC8CE8B14]: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.upgrades.FullClusterRestartIT.lambda$testSystemIndexMetadataIsUpgraded$15(FullClusterRestartIT.java:1630)
  at org.elasticsearch.test.ESTestCase.assertBusy(ESTestCase.java:1053)
  at org.elasticsearch.test.ESTestCase.assertBusy(ESTestCase.java:1026)
  at org.elasticsearch.upgrades.FullClusterRestartIT.testSystemIndexMetadataIsUpgraded(FullClusterRestartIT.java:1619)
  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.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)

```
qa/full-cluster-restart/src/test/java/org/elasticsearch/upgrades/FullClusterRestartIT.java
static int extractTotalHits(Map<?, ?> response) {
        return (Integer) XContentMapValues.extractValue("hits.total.value", response);
    }
    /**
     * Tests that a single document survives. Super basic smoke test.
     */
    public void testSingleDoc() throws IOException {
        String docLocation = "/" + index + "/_doc/1";
        String doc = "{\"test\": \"test\"}";
        if (isRunningAgainstOldCluster()) {
            Request createDoc = new Request("PUT", docLocation);
            createDoc.setJsonEntity(doc);
            client().performRequest(createDoc);
        }
        Request request = new Request("GET", docLocation);
        assertThat(toStr(client().performRequest(request)), containsString(doc));
    }
    /**
     * Tests that a single empty shard index is correctly recovered. Empty shards are often an edge case.
     */
    public void testEmptyShard() throws IOException {
        final String indexName = "test_empty_shard";
        if (isRunningAgainstOldCluster()) {
            Settings.Builder settings = Settings.builder()
                .put(IndexMetadata.INDEX_NUMBER_OF_SHARDS_SETTING.getKey(), 1)
                .put(IndexMetadata.INDEX_NUMBER_OF_REPLICAS_SETTING.getKey(), 1)