As we are rolling out the user profile feature, we'd like to expand the [Usage API](https://www.elastic.co/guide/en/elasticsearch/reference/current/usage-api.html) to report usage stats of user profiles such as (1) number of enabled user profiles and (2) number of user profiles that are [activated](https://www.elastic.co/guide/en/elasticsearch/reference/current/security-api-activate-user-profile.html) over the past X days. 

Response of the Usage API already contains a `security` field that groups relevant stats from security related features. We expect the new stats for user profiles should be added under it as well, for example:
```
{
  "security: {
    "user_profile": {
      "activated": 78,
      "recently_activated": 42  <1>
    }
  }
}
```
<1> The use of `recently_` is chosen to avoid the field to be tied to a specific time period so it is easier to evolve the definition in future.

x-pack/plugin/security/src/main/java/org/elasticsearch/xpack/security/Security.java
)
        );
        return settingsList;
    }
    @Override
    public Collection<RestHeaderDefinition> getRestHeaders() {
        Set<RestHeaderDefinition> headers = new HashSet<>();
        headers.add(new RestHeaderDefinition(UsernamePasswordToken.BASIC_AUTH_HEADER, false));
        headers.add(new RestHeaderDefinition(SecondaryAuthenticator.SECONDARY_AUTH_HEADER_NAME, false));
        if (XPackSettings.AUDIT_ENABLED.get(settings)) {
            headers.add(new RestHeaderDefinition(AuditTrail.X_FORWARDED_FOR_HEADER, true));
        }
        if (AuthenticationServiceField.RUN_AS_ENABLED.get(settings)) {
            headers.add(new RestHeaderDefinition(AuthenticationServiceField.RUN_AS_USER_HEADER, false));
        }
        headers.add(new RestHeaderDefinition(JwtRealm.HEADER_CLIENT_AUTHENTICATION, false));
        return headers;
    }
    @Override
    public List<String> getSettingsFilter() {
        List<String> asArray = settings.getAsList(SecurityField.setting("hide_settings"));
        ArrayList<String> settingsFilter = new ArrayList<>(asArray);
        
        settingsFilter.add("transport.profiles.*." + SecurityField.setting("*"));
        return settingsFilter;
    }
    @Override
    public List<BootstrapCheck> getBootstrapChecks() {
        return bootstrapChecks.get();
    }