code: public function searchableKeys($class, $view=self::VIEW_DEFAULT)
      {
          if ($provider = $this->nearestForClass($class, 'searchableKeys')) {
              return call_user_func($provider, $class, $view);
          }
          return [];
      }
docs: {@inheritdoc}
  
  @param string $class
  @param string $view (optional)
  @return array Just an indexed array of key names ([id, name, address.street])