Fix dropping search index

Error Cannot use object of type stdClass as array

Author: GromNaN

lib/Doctrine/ODM/MongoDB/SchemaManager.php

@@ -465,7 +465,7 @@ public function deleteDocumentSearchIndexes(string $documentName): void
         $collection = $this->dm->getDocumentCollection($class->name);
 
         try {
-            $searchIndexes = $collection->listSearchIndexes();
+            $searchIndexes = $collection->listSearchIndexes(['typeMap' => ['root' => 'bson']]);
         } catch (CommandException $e) {
             // If the server does not support search indexes, there are no indexes to remove in any case
             if ($this->isSearchIndexCommandException($e)) {