fix: Don't preserve keys when filtering out items to be skipped from …

…indexing

src/services/Sync.php

@@ -67,7 +67,7 @@ public function sync(Index $index, null|string|int $identifier): Generator
 			$size = count($chunk);
 
 			// Remove any falsy values from the chunk of data.
-			$chunk = array_filter($chunk);
+			$chunk = array_values(array_filter($chunk));
 			$this->meiliClient
 				->index($index->indexId)
 				->addDocuments($chunk, $index->getSettings()->primaryKey);