Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/search/src/Plugin/ConfigurableSearchPluginInterface.php

@@ -0,0 +1,28 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\search\Plugin\ConfigurableSearchPluginInterface.
+ */
+
+namespace Drupal\search\Plugin;
+
+use Drupal\Component\Plugin\ConfigurablePluginInterface;
+use Drupal\Core\Plugin\PluginFormInterface;
+
+/**
+ * Provides an interface for a configurable Search plugin.
+ */
+interface ConfigurableSearchPluginInterface extends ConfigurablePluginInterface, PluginFormInterface, SearchInterface {
+
+  /**
+   * Sets the ID for the search page using this plugin.
+   *
+   * @param string $search_page_id
+   *   The search page ID.
+   *
+   * @return static
+   */
+  public function setSearchPageId($search_page_id);
+
+}