#84142 is introducing an assertion which verifies that the cluster state we write to disk can be loaded again. This build failure shows that this assertion currently does not hold due to an undeclared field called `task_name`.

NB doesn't fail on `master` directly you need to check the PR branch, but it represents a genuine bug on `master`: if a node crashed after writing this state then it would not be able to restart.

**Build scan:**
https://gradle-enterprise.elastic.co/s/zne65f5ti7kfo/tests/:x-pack:plugin:shutdown:internalClusterTest/org.elasticsearch.xpack.shutdown.NodeShutdownTasksIT/testTasksAreNotAssignedToShuttingDownNode

**Reproduction line:**
`./gradlew ':x-pack:plugin:shutdown:internalClusterTest' --tests "org.elasticsearch.xpack.shutdown.NodeShutdownTasksIT.testTasksAreNotAssignedToShuttingDownNode" -Dtests.seed=E2D8712A01541857 -Dtests.locale=es-PY -Dtests.timezone=Africa/Kinshasa -Druntime.java=17`

**Applicable branches:**
~master~ https://github.com/elastic/elasticsearch/pull/84142/commits/3eb6089edb1ead5e33f4a081c4b5a2719d9c4217

**Reproduces locally?:**
Yes

**Failure history:**
https://gradle-enterprise.elastic.co/scans/tests?tests.container=org.elasticsearch.xpack.shutdown.NodeShutdownTasksIT&tests.test=testTasksAreNotAssignedToShuttingDownNode

**Failure excerpt:**

<details>
<summary>Expand for stack trace</summary>

```
WARNING: Uncaught exception in thread: Thread[elasticsearch[node_t0][cluster_coordination][T#1],5,TGRP-NodeShutdownTasksIT] |  
-- | --
  | java.lang.AssertionError: org.elasticsearch.gateway.CorruptStateException: org.elasticsearch.xcontent.XContentParseException: [-1:358] [persistent_tasks] failed to parse field [tasks] |  
  | at __randomizedtesting.SeedInfo.seed([E2D8712A01541857]:0) |  
  | at org.elasticsearch.gateway.PersistedClusterStateService$Writer.assertOnCommit(PersistedClusterStateService.java:1020) |  
  | at org.elasticsearch.gateway.PersistedClusterStateService$Writer.commit(PersistedClusterStateService.java:1007) |  
  | at org.elasticsearch.gateway.PersistedClusterStateService$Writer.writeIncrementalStateAndCommit(PersistedClusterStateService.java:823) |  
  | at org.elasticsearch.gateway.GatewayMetaState$LucenePersistedState.setLastAcceptedState(GatewayMetaState.java:507) |  
  | at org.elasticsearch.cluster.coordination.CoordinationState.handlePublishRequest(CoordinationState.java:392) |  
  | at org.elasticsearch.cluster.coordination.Coordinator.handlePublishRequest(Coordinator.java:418) |  
  | at org.elasticsearch.cluster.coordination.PublicationTransportHandler.acceptState(PublicationTransportHandler.java:200) |  
  | at org.elasticsearch.cluster.coordination.PublicationTransportHandler.handleIncomingPublishRequest(PublicationTransportHandler.java:183) |  
  | at org.elasticsearch.cluster.coordination.PublicationTransportHandler.lambda$new$0(PublicationTransportHandler.java:103) |  
  | at org.elasticsearch.transport.RequestHandlerRegistry.processMessageReceived(RequestHandlerRegistry.java:67) |  
  | at org.elasticsearch.transport.TransportService$6.doRun(TransportService.java:917) |  
  | at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:776) |  
  | at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:26) |  
  | at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) |  
  | at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) |  
  | at java.base/java.lang.Thread.run(Thread.java:833) |  
  | Caused by: org.elasticsearch.gateway.CorruptStateException: org.elasticsearch.xcontent.XContentParseException: [-1:358] [persistent_tasks] failed to parse field [tasks] |  
  | at org.elasticsearch.gateway.PersistedClusterStateService.readXContent(PersistedClusterStateService.java:539) |  
  | at org.elasticsearch.gateway.PersistedClusterStateService.lambda$loadOnDiskState$2(PersistedClusterStateService.java:493) |  
  | at org.elasticsearch.gateway.PersistedClusterStateService.consumeFromType(PersistedClusterStateService.java:580) |  
  | at org.elasticsearch.gateway.PersistedClusterStateService.loadOnDiskState(PersistedClusterStateService.java:492) |  
  | at org.elasticsearch.gateway.PersistedClusterStateService$Writer.assertOnCommit(PersistedClusterStateService.java:1016) |  
  | ... 15 more |  
  | Caused by: org.elasticsearch.xcontent.XContentParseException: [-1:358] [persistent_tasks] failed to parse field [tasks] |  
  | at org.elasticsearch.xcontent.ObjectParser.throwFailedToParse(ObjectParser.java:626) |  
  | at org.elasticsearch.xcontent.ObjectParser.parseValue(ObjectParser.java:621) |  
  | at org.elasticsearch.xcontent.ObjectParser.parseArray(ObjectParser.java:614) |  
  | at org.elasticsearch.xcontent.ObjectParser.parseSub(ObjectParser.java:647) |  
  | at org.elasticsearch.xcontent.ObjectParser.parse(ObjectParser.java:319) |  
  | at org.elasticsearch.xcontent.ObjectParser.parse(ObjectParser.java:258) |  
  | at org.elasticsearch.xcontent.ObjectParser.apply(ObjectParser.java:392) |  
  | at org.elasticsearch.persistent.PersistentTasksCustomMetadata.fromXContent(PersistentTasksCustomMetadata.java:208) |  
  | at org.elasticsearch.xcontent.NamedXContentRegistry$Entry.lambda$new$0(NamedXContentRegistry.java:54) |  
  | at org.elasticsearch.xcontent.NamedXContentRegistry.parseNamedObject(NamedXContentRegistry.java:147) |  
  | at org.elasticsearch.xcontent.support.AbstractXContentParser.namedObject(AbstractXContentParser.java:416) |  
  | at org.elasticsearch.cluster.metadata.Metadata$Builder.fromXContent(Metadata.java:2188) |  
  | at org.elasticsearch.gateway.PersistedClusterStateService.readXContent(PersistedClusterStateService.java:537) |  
  | ... 19 more |  
  | Caused by: org.elasticsearch.xcontent.XContentParseException: [-1:358] [tasks] failed to parse field [task] |  
  | at org.elasticsearch.xcontent.ObjectParser.throwFailedToParse(ObjectParser.java:626) |  
  | at org.elasticsearch.xcontent.ObjectParser.parseValue(ObjectParser.java:621) |  
  | at org.elasticsearch.xcontent.ObjectParser.parseSub(ObjectParser.java:633) |  
  | at org.elasticsearch.xcontent.ObjectParser.parse(ObjectParser.java:319) |  
  | at org.elasticsearch.xcontent.ObjectParser.parse(ObjectParser.java:258) |  
  | at org.elasticsearch.xcontent.AbstractObjectParser.lambda$declareFieldArray$20(AbstractObjectParser.java:336) |  
  | at org.elasticsearch.xcontent.AbstractObjectParser.parseArray(AbstractObjectParser.java:418) |  
  | at org.elasticsearch.xcontent.AbstractObjectParser.lambda$declareFieldArray$21(AbstractObjectParser.java:336) |  
  | at org.elasticsearch.xcontent.ObjectParser.lambda$declareField$10(ObjectParser.java:441) |  
  | at org.elasticsearch.xcontent.ObjectParser.parseValue(ObjectParser.java:619) |  
  | ... 30 more |  
  | Caused by: org.elasticsearch.xcontent.XContentParseException: [-1:358] [task] failed to parse field [task_name] |  
  | at org.elasticsearch.xcontent.ObjectParser.rethrowFieldParseFailure(ObjectParser.java:564) |  
  | at org.elasticsearch.xcontent.ObjectParser.lambda$declareNamedObjects$14(ObjectParser.java:504) |  
  | at org.elasticsearch.xcontent.ObjectParser.lambda$declareNamedObjects$15(ObjectParser.java:515) |  
  | at org.elasticsearch.xcontent.ObjectParser.parseValue(ObjectParser.java:619) |  
  | ... 38 more |  
  | Caused by: org.elasticsearch.xcontent.XContentParseException: [-1:358] [named] failed to parse field [params] |  
  | at org.elasticsearch.xcontent.ObjectParser.throwFailedToParse(ObjectParser.java:626) |  
  | at org.elasticsearch.xcontent.ObjectParser.parseValue(ObjectParser.java:621) |  
  | at org.elasticsearch.xcontent.ObjectParser.parseSub(ObjectParser.java:633) |  
  | at org.elasticsearch.xcontent.ObjectParser.parse(ObjectParser.java:319) |  
  | at org.elasticsearch.persistent.PersistentTasksCustomMetadata.lambda$static$3(PersistentTasksCustomMetadata.java:97) |  
  | at org.elasticsearch.xcontent.ObjectParser.lambda$declareNamedObjects$14(ObjectParser.java:502) |  
  | ... 40 more |  
  | Caused by: org.elasticsearch.xcontent.NamedObjectNotFoundException: [-1:358] unknown field [task_name] |  
  | at org.elasticsearch.xcontent.NamedXContentRegistry.lookupParser(NamedXContentRegistry.java:162) |  
  | at org.elasticsearch.xcontent.NamedXContentRegistry.parseNamedObject(NamedXContentRegistry.java:146) |  
  | at org.elasticsearch.xcontent.support.AbstractXContentParser.namedObject(AbstractXContentParser.java:416) |  
  | at org.elasticsearch.persistent.PersistentTasksCustomMetadata.lambda$static$1(PersistentTasksCustomMetadata.java:89) |  
  | at org.elasticsearch.xcontent.ObjectParser.lambda$declareField$10(ObjectParser.java:441) |  
  | at org.elasticsearch.xcontent.ObjectParser.parseValue(ObjectParser.java:619) |  
  | ... 44 more |  
```
</details>
x-pack/plugin/shutdown/src/internalClusterTest/java/org/elasticsearch/xpack/shutdown/NodeShutdownTasksIT.java
public class NodeShutdownTasksIT extends ESIntegTestCase {
    private static final Logger logger = LogManager.getLogger(NodeShutdownTasksIT.class);
    private static final AtomicBoolean startTask = new AtomicBoolean(false);
    private static final AtomicBoolean taskCompleted = new AtomicBoolean(false);
    private static final AtomicReference<Collection<DiscoveryNode>> candidates = new AtomicReference<>(null);
    @Override
    protected Collection<Class<? extends Plugin>> nodePlugins() {
        return Arrays.asList(ShutdownPlugin.class, TaskPlugin.class);
    }
    public void testTasksAreNotAssignedToShuttingDownNode() throws Exception {
        
        final String node1 = internalCluster().startNode();
        final String node2 = internalCluster().startNode();
        final String shutdownNode;
        final String candidateNode;
        NodesInfoResponse nodes = client().admin().cluster().prepareNodesInfo().clear().get();
        final String node1Id = nodes.getNodes()
            .stream()
            .map(NodeInfo::getNode)
            .filter(node -> node.getName().equals(node1))
            .map(DiscoveryNode::getId)
            .findFirst()
            .orElseThrow();
        final String node2Id = nodes.getNodes()
            .stream()
            .map(NodeInfo::getNode)
            .filter(node -> node.getName().equals(node2))
            .map(DiscoveryNode::getId)
            .findFirst()
            .orElseThrow();