diff --git a/core/modules/search/search.api.php b/core/modules/search/search.api.php
index c0352e7..d61ee35 100644
--- a/core/modules/search/search.api.php
+++ b/core/modules/search/search.api.php
@@ -15,7 +15,7 @@
  *
  * This hook is called to preprocess both the text added to the search index
  * and the keywords users have submitted for searching. The same processing
- * needs to be applied to both so that searches will return results.
+ * needs to be applied to both so that searches will find matches.
  *
  * Possible uses:
  * - Adding spaces between words of Chinese or Japanese text.
@@ -47,9 +47,14 @@
  * @ingroup search
  */
 function hook_search_preprocess($text, $langcode = NULL) {
+  // If the language is not set, get it from the language manager.
+  if (!isset($langcode)) {
+    $langcode = \Drupal::languageManager()->getCurrentLanguage()->getId();
+  }
+
   // If the langcode is set to 'en' then add variations of the word "testing"
   // which can also be found during English language searches.
-  if (isset($langcode) && $langcode == 'en') {
+  if ($langcode == 'en') {
     // Add the alternate verb forms for the word "testing".
     if ($text == 'we are testing') {
       $text .= ' test tested';