SearchInterface

class \Drupal\help\Plugin\Search\HelpSearch extends \Drupal\search\Plugin\SearchPluginBase implements \Drupal\Core\Access\AccessibleInterface, \Drupal\search\Plugin\SearchIndexingInterface
class \Drupal\node\Plugin\Search\NodeSearch extends \Drupal\search\Plugin\ConfigurableSearchPluginBase implements \Drupal\Core\Access\AccessibleInterface, \Drupal\search\Plugin\SearchIndexingInterface, \Drupal\Core\Security\TrustedCallbackInterface
class \Drupal\search\Plugin\ConfigurableSearchPluginBase extends \Drupal\search\Plugin\SearchPluginBase implements \Drupal\search\Plugin\ConfigurableSearchPluginInterface
class \Drupal\search\Plugin\SearchPluginBase extends \Drupal\Core\Plugin\PluginBase implements \Drupal\Core\Plugin\ContainerFactoryPluginInterface, \Drupal\search\Plugin\SearchInterface, \Drupal\Core\Cache\RefinableCacheableDependencyInterface uses \Drupal\Core\Cache\RefinableCacheableDependencyTrait
class \Drupal\user\Plugin\Search\UserSearch extends \Drupal\search\Plugin\SearchPluginBase implements \Drupal\Core\Access\AccessibleInterface