[Bug]: Add 'doc_as_upsert' to bulk operation data (#373)

Author: kingjia90

src/SearchIndexAdapter/DefaultSearch/BulkOperationService.php

@@ -67,6 +67,7 @@ public function addUpdate(
 
         $this->bulkOperationData[] = [
             'doc' => $updateData,
+            'doc_as_upsert' => true
         ];
     }