Merge pull request #5310 in SW/shopware from sw-19519/5.3/add-number-to-search-condition to 5.3

* commit '283e2134cedf796ffc7498384e14312a945156af':
  SW-19519 - Add main detail number as search field

Author: janbuecker

engine/Shopware/Controllers/Backend/Search.php

@@ -23,6 +23,7 @@
  */
 
 use Doctrine\DBAL\Connection;
+use Shopware\Models\Article\Article;
 
 /**
  * Backend search controller
@@ -353,6 +354,12 @@ private function addSearchTermCondition($entity, $query, $term)
             return 'entity.' . $field;
         }, $fields);
 
+        switch ($entity) {
+            case Article::class:
+                $fields[] = 'mainDetail.number';
+                break;
+        }
+
         $builder->addSearchTerm($query, $term, $fields);
     }