### 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
masterHistoryService
            );
            HealthService healthService = createHealthService(clusterService, clusterModule, coordinationDiagnosticsService, threadPool);
            HealthMetadataService healthMetadataService = HealthMetadataService.create(clusterService, settings);
            LocalHealthMonitor localHealthMonitor = LocalHealthMonitor.create(settings, clusterService, nodeService, threadPool, client);
            HealthInfoCache nodeHealthOverview = HealthInfoCache.create(clusterService);
            HealthApiStats healthApiStats = new HealthApiStats();
            modules.add(b -> {
                b.bind(Node.class).toInstance(this);
                b.bind(NodeService.class).toInstance(nodeService);
                b.bind(NamedXContentRegistry.class).toInstance(xContentRegistry);
                b.bind(PluginsService.class).toInstance(pluginsService);
                b.bind(Client.class).toInstance(client);
                b.bind(NodeClient.class).toInstance(client);
                b.bind(Environment.class).toInstance(this.environment);
                b.bind(ThreadPool.class).toInstance(threadPool);
                b.bind(NodeEnvironment.class).toInstance(nodeEnvironment);
                b.bind(ResourceWatcherService.class).toInstance(resourceWatcherService);
                b.bind(CircuitBreakerService.class).toInstance(circuitBreakerService);
                b.bind(BigArrays.class).toInstance(bigArrays);
                b.bind(PageCacheRecycler.class).toInstance(pageCacheRecycler);
                b.bind(ScriptService.class).toInstance(scriptService);
                b.bind(AnalysisRegistry.class).toInstance(analysisModule.getAnalysisRegistry());
                b.bind(IngestService.class).toInstance(ingestService);
                b.bind(IndexingPressure.class).toInstance(indexingLimits);
                b.bind(UsageService.class).toInstance(usageService);
                b.bind(AggregationUsageService.class).toInstance(searchModule.getValuesSourceRegistry().getUsageService());
                b.bind(NamedWriteableRegistry.class).toInstance(namedWriteableRegistry);
                b.bind(MetadataUpgrader.class).toInstance(metadataUpgrader);
                b.bind(MetaStateService.class).toInstance(metaStateService);