fixed bugs

app/services/vector_store.py

@@ -29,7 +29,6 @@ class VectorStoreService:
         self.client = get_qdrant_client()
 
     def create_collection(self, collection_name: str) -> bool:
-        """Create a new collection for a chatbot"""
         try:
             self.client.create_collection(
                 collection_name=collection_name,
@@ -38,6 +37,12 @@ class VectorStoreService:
                     distance=Distance.COSINE,
                 ),
             )
+            # Create payload index for filtering/deleting by document_id
+            self.client.create_payload_index(
+                collection_name=collection_name,
+                field_name="document_id",
+                field_schema="keyword",
+            )
             logger.info(f"Created collection: {collection_name}")
             return True
         except Exception as e:
@@ -102,12 +107,12 @@ class VectorStoreService:
     ) -> List[Dict[str, Any]]:
         """Search for similar vectors"""
         try:
-            results = self.client.search(
+            results = self.client.query_points(
                 collection_name=collection_name,
-                query_vector=query_vector,
+                query=query_vector,
                 limit=limit,
                 score_threshold=score_threshold,
-            )
+            ).points
             return [
                 {
                     "id": str(r.id),