added Hybrid Search with BM25

app.py

@@ -272,7 +272,7 @@ class BSIChatbot:
         # Iteriere über alle IDs im index_to_docstore_id
         for doc_id in vectorstore.index_to_docstore_id.values():
             # Hole das Dokument aus dem docstore
-            document = vector_store.docstore[doc_id]
+            document = vectorstore.docstore[doc_id]
             all_documents.append(document)
 
         return all_documents