Expanded class hierarchy of DataTypeInterface in Search API 8
- interface \Drupal\search_api\Plugin\HideablePluginInterface; interface \Drupal\Component\Plugin\PluginInspectionInterface; interface \Drupal\Component\Plugin\DerivativeInspectionInterface; interface \Drupal\Core\Plugin\ContainerFactoryPluginInterface
- interface \Drupal\search_api\DataType\DataTypeInterface