Try inserting search keywords 3 times

fixes #15221

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## Unreleased
 
 - Fixed an error that could occur when duplicating an element with an Assets field that had a dynamic subpath. ([#16214](https://github.com/craftcms/cms/issues/16214))
+- Reduced the likelihood of a deadlock error occurring when updating search indexes. ([#15221](https://github.com/craftcms/cms/issues/15221))
 
 ## 4.13.3 - 2024-11-22
 

src/services/Search.php

@@ -27,6 +27,7 @@
 use craft\search\SearchQueryTermGroup;
 use Throwable;
 use yii\base\Component;
+use yii\db\Exception;
 use yii\db\Expression;
 use yii\db\Schema;
 
@@ -483,7 +484,20 @@ private function _indexKeywords(ElementInterface $element, string $keywords, ?st
         }
 
         // Insert/update the row in searchindex
-        Db::insert(Table::SEARCHINDEX, $columns);
+        for ($try = 0; $try < 3; $try++) {
+            try {
+                Db::insert(Table::SEARCHINDEX, $columns);
+                return;
+            } catch (Exception $e) {
+                if (str_contains($e->getPrevious()?->getMessage(), 'deadlock')) {
+                    // A gap lock was probably hit. Try again in one second
+                    // https://github.com/craftcms/cms/issues/15221
+                    sleep(1);
+                } else {
+                    throw $e;
+                }
+            }
+        }
     }
 
     /**