### 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
NetworkService.CustomNameResolver customNameResolver = discoveryPlugin.getCustomNameResolver(settings());
            if (customNameResolver != null) {
                customNameResolvers.add(customNameResolver);
            }
        }
        return customNameResolvers;
    }
    /**
     * Constructs a ClusterInfoService which may be mocked for tests.
     */
    protected ClusterInfoService newClusterInfoService(
        Settings settings,
        ClusterService clusterService,
        ThreadPool threadPool,
        NodeClient client
    ) {
        final InternalClusterInfoService service = new InternalClusterInfoService(settings, clusterService, threadPool, client);
        if (DiscoveryNode.isMasterNode(settings)) {
            
            clusterService.addListener(service);
        }
        return service;
    }
    /**
     * Constructs a {@link org.elasticsearch.http.HttpServerTransport} which may be mocked for tests.
     */
    protected HttpServerTransport newHttpTransport(NetworkModule networkModule) {
        return networkModule.getHttpServerTransportSupplier().get();
    }
    private static class LocalNodeFactory implements Function<BoundTransportAddress, DiscoveryNode> {