<chore>: adjustments on mongo atlas vector store

src/backend/base/langflow/components/vectorstores/MongoDBAtlasVector.py

@@ -83,7 +83,7 @@ class MongoVectorStoreComponent(LCVectorStoreComponent):
         return vector_store
 
     def search_documents(self) -> List[Data]:
-        from typing import Union
+        from typing import Optional, Union
         from bson import ObjectId
         from langchain.schema import Document
         import json