### 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
import org.elasticsearch.script.ScriptEngine;
import org.elasticsearch.script.ScriptModule;
import org.elasticsearch.script.ScriptService;
import org.elasticsearch.search.SearchModule;
import org.elasticsearch.search.SearchService;
import org.elasticsearch.search.SearchUtils;
import org.elasticsearch.search.aggregations.support.AggregationUsageService;
import org.elasticsearch.search.fetch.FetchPhase;
import org.elasticsearch.shutdown.PluginShutdownService;
import org.elasticsearch.snapshots.InternalSnapshotsInfoService;
import org.elasticsearch.snapshots.RepositoryIntegrityHealthIndicatorService;
import org.elasticsearch.snapshots.RestoreService;
import org.elasticsearch.snapshots.SnapshotShardsService;
import org.elasticsearch.snapshots.SnapshotsInfoService;
import org.elasticsearch.snapshots.SnapshotsService;
import org.elasticsearch.tasks.Task;
import org.elasticsearch.tasks.TaskCancellationService;
import org.elasticsearch.tasks.TaskManager;
import org.elasticsearch.tasks.TaskResultsService;
import org.elasticsearch.threadpool.ExecutorBuilder;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.tracing.Tracer;
import org.elasticsearch.transport.Transport;
import org.elasticsearch.transport.TransportInterceptor;
import org.elasticsearch.transport.TransportService;
import org.elasticsearch.upgrades.SystemIndexMigrationExecutor;
import org.elasticsearch.usage.UsageService;
import org.elasticsearch.watcher.ResourceWatcherService;
import org.elasticsearch.xcontent.NamedXContentRegistry;
import java.io.BufferedWriter;