docs: private static DirectoryGrouping resolveDirectoryGrouping(final ModelNode model, final ExpressionResolver expressionResolver) {
          try {
              return DirectoryGrouping.forName(HostResourceDefinition.DIRECTORY_GROUPING.resolveModelAttribute(expressionResolver, model).asString());
          } catch (OperationFailedException e) {
              throw new IllegalStateException(e);
          }
      }