### Description

Elasticsearch defines the concept of a [feature](https://www.elastic.co/guide/en/elasticsearch/reference/current/get-features-api.html) for the purpose of better managing them when snapshotting/restoring them via the [feature_states field](https://www.elastic.co/guide/en/elasticsearch/reference/current/create-snapshot-api.html#create-snapshot-api-feature-states)

The `shards_availability` health indicator currently diagnoses the condition of indices needing to be [restored from a snapshot](https://github.com/elastic/elasticsearch/blob/main/server/src/main/java/org/elasticsearch/cluster/routing/allocation/ShardsAvailabilityHealthIndicatorService.java#L138) and recommends a [troubleshooting guide](http://ela.st/restore-snapshot)

However, since `8.x` the restore API **must** use `feature_states` instead of specifying systems indices or system data streams as part of the `indices` field.

This proposes the `affected_resources` for the `restore_from_snapshot` diagnosis return the indices that are not part of a `feature` under the `INDICES` type, and a new type `FEATURES`.
e.g. instead of current behaviour
```
"affected_resources": {
  "indices": [
    ".geoip_databases",
    "test_index"
    ]
}
```
we could return:
```
"affected_resources": {
  "indices": [
    "test_index"
   ], 
  "features": [
     "geoip"
  ]
}
```



server/src/main/java/org/elasticsearch/node/Node.java
BigArrays bigArrays = createBigArrays(pageCacheRecycler, circuitBreakerService);
            modules.add(settingsModule);
            final MetaStateService metaStateService = new MetaStateService(nodeEnvironment, xContentRegistry);
            final PersistedClusterStateService persistedClusterStateService = new PersistedClusterStateService(
                nodeEnvironment,
                xContentRegistry,
                clusterService.getClusterSettings(),
                threadPool::relativeTimeInMillis
            );
            
            final Collection<EnginePlugin> enginePlugins = pluginsService.filterPlugins(EnginePlugin.class);
            final Collection<Function<IndexSettings, Optional<EngineFactory>>> engineFactoryProviders = enginePlugins.stream()
                .map(plugin -> (Function<IndexSettings, Optional<EngineFactory>>) plugin::getEngineFactory)
                .toList();
            final Map<String, IndexStorePlugin.DirectoryFactory> indexStoreFactories = pluginsService.filterPlugins(IndexStorePlugin.class)
                .stream()
                .map(IndexStorePlugin::getDirectoryFactories)
                .flatMap(m -> m.entrySet().stream())
                .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
            final Map<String, IndexStorePlugin.RecoveryStateFactory> recoveryStateFactories = pluginsService.filterPlugins(
                IndexStorePlugin.class
            )
                .stream()
                .map(IndexStorePlugin::getRecoveryStateFactories)
                .flatMap(m -> m.entrySet().stream())
                .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
            final List<IndexStorePlugin.IndexFoldersDeletionListener> indexFoldersDeletionListeners = pluginsService.filterPlugins(
                IndexStorePlugin.class
            ).stream().map(IndexStorePlugin::getIndexFoldersDeletionListeners).flatMap(List::stream).toList();
            final Map<String, IndexStorePlugin.SnapshotCommitSupplier> snapshotCommitSuppliers = pluginsService.filterPlugins(