### 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
);
            final ClusterModule clusterModule = new ClusterModule(
                settings,
                clusterService,
                clusterPlugins,
                clusterInfoService,
                snapshotsInfoService,
                threadPool,
                systemIndices,
                writeLoadForecaster
            );
            modules.add(clusterModule);
            IndicesModule indicesModule = new IndicesModule(pluginsService.filterPlugins(MapperPlugin.class));
            modules.add(indicesModule);
            List<BreakerSettings> pluginCircuitBreakers = pluginsService.filterPlugins(CircuitBreakerPlugin.class)
                .stream()
                .map(plugin -> plugin.getCircuitBreaker(settings))
                .toList();
            final CircuitBreakerService circuitBreakerService = createCircuitBreakerService(
                settingsModule.getSettings(),
                pluginCircuitBreakers,
                settingsModule.getClusterSettings()
            );
            pluginsService.filterPlugins(CircuitBreakerPlugin.class).forEach(plugin -> {
                CircuitBreaker breaker = circuitBreakerService.getBreaker(plugin.getCircuitBreaker(settings).getName());
                plugin.setCircuitBreaker(breaker);
            });
            resourcesToClose.add(circuitBreakerService);
            modules.add(new GatewayModule());
            PageCacheRecycler pageCacheRecycler = createPageCacheRecycler(settings);