class SearchPluginCollection

class SearchPluginCollection extends DefaultSingleLazyPluginCollection {
    
    /**
     * The unique ID for the search page using this plugin collection.
     *
     * @var string
     */
    protected $searchPageId;
    
    /**
     * Constructs a new SearchPluginCollection.
     *
     * @param \Drupal\Component\Plugin\PluginManagerInterface $manager
     *   The manager to be used for instantiating plugins.
     * @param string $instance_id
     *   The ID of the plugin instance.
     * @param array $configuration
     *   An array of configuration.
     * @param string $search_page_id
     *   The unique ID of the search page using this plugin.
     */
    public function __construct(PluginManagerInterface $manager, $instance_id, array $configuration, $search_page_id) {
        parent::__construct($manager, $instance_id, $configuration);
        $this->searchPageId = $search_page_id;
    }
    
    /**
     * {@inheritdoc}
     *
     * @return \Drupal\search\Plugin\SearchInterface
     */
    public function &get($instance_id) {
        return parent::get($instance_id);
    }
    
    /**
     * {@inheritdoc}
     */
    protected function initializePlugin($instance_id) {
        parent::initializePlugin($instance_id);
        $plugin_instance = $this->pluginInstances[$instance_id];
        if ($plugin_instance instanceof ConfigurableSearchPluginInterface) {
            $plugin_instance->setSearchPageId($this->searchPageId);
        }
    }

}