core/modules/node/src/Plugin/Search/NodeSearch.php         | 4 +---
 core/modules/search/search.module                          | 6 +-----
 core/modules/search/src/Plugin/SearchIndexingInterface.php | 3 ---
 3 files changed, 2 insertions(+), 11 deletions(-)

diff --git a/core/modules/node/src/Plugin/Search/NodeSearch.php b/core/modules/node/src/Plugin/Search/NodeSearch.php
index f963e6b..083c359 100644
--- a/core/modules/node/src/Plugin/Search/NodeSearch.php
+++ b/core/modules/node/src/Plugin/Search/NodeSearch.php
@@ -368,15 +368,13 @@ public function updateIndex() {
     $result = $this->database->queryRange("SELECT n.nid, MAX(sd.reindex) FROM {node} n LEFT JOIN {search_dataset} sd ON sd.sid = n.nid AND sd.type = :type WHERE sd.sid IS NULL OR sd.reindex <> 0 GROUP BY n.nid ORDER BY MAX(sd.reindex) is null DESC, MAX(sd.reindex) ASC, n.nid ASC", 0, $limit, array(':type' => $this->getPluginId()), array('target' => 'replica'));
     $nids = $result->fetchCol();
     if (!$nids) {
-      return FALSE;
+      return;
     }
 
     $node_storage = $this->entityManager->getStorage('node');
     foreach ($node_storage->loadMultiple($nids) as $node) {
       $this->indexNode($node);
     }
-
-    return TRUE;
   }
 
   /**
diff --git a/core/modules/search/search.module b/core/modules/search/search.module
index 95c9442..a67eefd 100644
--- a/core/modules/search/search.module
+++ b/core/modules/search/search.module
@@ -190,11 +190,7 @@ function search_cron() {
   /** @var $search_page_repository \Drupal\search\SearchPageRepositoryInterface */
   $search_page_repository = \Drupal::service('search.search_page_repository');
   foreach ($search_page_repository->getIndexableSearchPages() as $entity) {
-    $updated = $entity->getPlugin()->updateIndex();
-    if ($updated) {
-      // Invalidate all search pages that contain data for the index of this plugin.
-      Cache::invalidateTags(['search_index:' . $entity->getPlugin()->getPluginId()]);
-    }
+    $entity->getPlugin()->updateIndex();
   }
 }
 
diff --git a/core/modules/search/src/Plugin/SearchIndexingInterface.php b/core/modules/search/src/Plugin/SearchIndexingInterface.php
index 0781423..93aec02 100644
--- a/core/modules/search/src/Plugin/SearchIndexingInterface.php
+++ b/core/modules/search/src/Plugin/SearchIndexingInterface.php
@@ -46,9 +46,6 @@
    * your run, you should update any needed internal bookkeeping on when items
    * have last been indexed as you go rather than waiting to the end of
    * indexing.
-   *
-   * @return bool
-   *   TRUE if any updates happened, FALSE otherwise.
    */
   public function updateIndex();