Fatal error: Uncaught Error: Class "Drupal\search\Plugin\ConfigurableSearchPluginBase" not found in /home/www/drupal8/test/core/modules/node/src/Plugin/Search/NodeSearch.php:35 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/node/src/Plugin/Search/NodeSearch.php on line 35