### 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
*/
    @SuppressForbidden(reason = "Cannot guarantee that the temp config path is relative to the environment")
    public static void deleteTemporaryApmConfig(JvmInfo jvmInfo, BiConsumer<Exception, Path> errorHandler) {
        for (String inputArgument : jvmInfo.getInputArguments()) {
            if (inputArgument.startsWith("-javaagent:")) {
                final String agentArg = inputArgument.substring(11);
                final String[] parts = agentArg.split("=", 2);
                String APM_AGENT_CONFIG_FILE_REGEX = String.join(
                    "\\" + File.separator,
                    ".*modules",
                    "apm",
                    "elastic-apm-agent-\\d+\\.\\d+\\.\\d+\\.jar"
                );
                if (parts[0].matches(APM_AGENT_CONFIG_FILE_REGEX)) {
                    if (parts.length == 2 && parts[1].startsWith("c=")) {
                        final Path apmConfig = PathUtils.get(parts[1].substring(2));
                        if (apmConfig.getFileName().toString().matches("^\\.elstcapm\\..*\\.tmp")) {
                            try {
                                Files.deleteIfExists(apmConfig);
                            } catch (IOException e) {
                                errorHandler.accept(e, apmConfig);
                            }
                        }
                    }
                    return;
                }
            }
        }
    }
    private Tracer getTracer(PluginsService pluginsService, Settings settings) {