**Build scan:**
https://gradle-enterprise.elastic.co/s/ibqgql7fylvvw/tests/:qa:rolling-upgrade:v7.17.15%23bwcTest/org.elasticsearch.upgrades.FeatureUpgradeIT/testGetFeatureUpgradeStatus%20%7BupgradedNodes=3%7D
**Reproduction line:**
```
./gradlew ':qa:rolling-upgrade:v7.17.15#bwcTest' -Dtests.class="org.elasticsearch.upgrades.FeatureUpgradeIT" -Dtests.method="testGetFeatureUpgradeStatus {upgradedNodes=3}" -Dtests.seed=85641CEF59F01F1F -Dtests.bwc=true -Dtests.locale=ja-JP-u-ca-japanese-x-lvariant-JP -Dtests.timezone=Europe/Bratislava -Druntime.java=21
```

**Applicable branches:**
main

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

**Failure history:**
https://gradle-enterprise.elastic.co/scans/tests?tests.container=org.elasticsearch.upgrades.FeatureUpgradeIT&tests.test=testGetFeatureUpgradeStatus%20%7BupgradedNodes%3D3%7D


**Failure excerpt:**
```
java.lang.RuntimeException: An error occurred while checking cluster 'test-cluster' status.

  at __randomizedtesting.SeedInfo.seed([85641CEF59F01F1F:4A3B8B4A3EE04BD8]:0)
  at org.elasticsearch.test.cluster.local.DefaultLocalClusterHandle.waitUntilReady(DefaultLocalClusterHandle.java:188)
  at org.elasticsearch.test.cluster.local.DefaultLocalClusterHandle.upgradeNodeToVersion(DefaultLocalClusterHandle.java:151)
  at org.elasticsearch.test.cluster.local.DefaultLocalElasticsearchCluster.upgradeNodeToVersion(DefaultLocalElasticsearchCluster.java:134)
  at org.elasticsearch.upgrades.ParameterizedRollingUpgradeTestCase.upgradeNode(ParameterizedRollingUpgradeTestCase.java:126)
  at jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
  at java.lang.reflect.Method.invoke(Method.java:580)
  at com.carrotsearch.randomizedtesting.RandomizedRunner.invoke(RandomizedRunner.java:1758)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$9.evaluate(RandomizedRunner.java:980)
  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.elasticsearch.test.cluster.local.DefaultLocalElasticsearchCluster$1.evaluate(DefaultLocalElasticsearchCluster.java:39)
  at org.junit.rules.ExternalResource$1.evaluate(ExternalResource.java:48)
  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:1583)

  Caused by: java.io.IOException: 408 Request Timeout

    at org.elasticsearch.test.cluster.local.WaitForHttpResource.checkResource(WaitForHttpResource.java:129)
    at org.elasticsearch.test.cluster.local.WaitForHttpResource.waitFor(WaitForHttpResource.java:107)
    at org.elasticsearch.test.cluster.local.DefaultLocalClusterHandle.waitUntilReady(DefaultLocalClusterHandle.java:186)
    at org.elasticsearch.test.cluster.local.DefaultLocalClusterHandle.upgradeNodeToVersion(DefaultLocalClusterHandle.java:151)
    at org.elasticsearch.test.cluster.local.DefaultLocalElasticsearchCluster.upgradeNodeToVersion(DefaultLocalElasticsearchCluster.java:134)
    at org.elasticsearch.upgrades.ParameterizedRollingUpgradeTestCase.upgradeNode(ParameterizedRollingUpgradeTestCase.java:126)
    at jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
    at java.lang.reflect.Method.invoke(Method.java:580)
    at com.carrotsearch.randomizedtesting.RandomizedRunner.invoke(RandomizedRunner.java:1758)
    at com.carrotsearch.randomizedtesting.RandomizedRunner$9.evaluate(RandomizedRunner.java:980)
    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.elasticsearch.test.cluster.local.DefaultLocalElasticsearchCluster$1.evaluate(DefaultLocalElasticsearchCluster.java:39)
    at org.junit.rules.ExternalResource$1.evaluate(ExternalResource.java:48)
    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:1583)

```
server/src/main/java/org/elasticsearch/indices/SystemIndexMappingUpdateService.java
private static final Logger logger = LogManager.getLogger(SystemIndexMappingUpdateService.class);
    public static final Set<String> MANAGED_SYSTEM_INDEX_SETTING_UPDATE_ALLOWLIST;
    static {
        Set<String> allowlist = new HashSet<>();
        
        for (IndexMetadata.APIBlock blockType : IndexMetadata.APIBlock.values()) {
            allowlist.add(blockType.settingName());
        }
        MANAGED_SYSTEM_INDEX_SETTING_UPDATE_ALLOWLIST = Collections.unmodifiableSet(allowlist);
    }
    private final SystemIndices systemIndices;
    private final Client client;
    private final AtomicBoolean isUpgradeInProgress;
    /**
     * Creates a new manager
     * @param systemIndices the indices to manage
     * @param client used to update the cluster
     */
    public SystemIndexMappingUpdateService(SystemIndices systemIndices, Client client) {