minor fixes

app.py

@@ -7,7 +7,7 @@ import torch
 import time
 from sentence_transformers import SentenceTransformer
 from langchain.vectorstores import Chroma
-from langchain.docstore.document import Document
+from langchain.docstore.document import Document as Document2
 from langchain_community.embeddings import HuggingFaceEmbeddings
 
 
@@ -104,7 +104,7 @@ embeddings = embed_chunks(chunks)
 # Step 3: Prepare documents (unchanged)
 def prepare_documents_for_chroma(embeddings):
     return [
-        Document(page_content=entry["chunk"], metadata={"chunk_index": i})
+        Document2(page_content=entry["chunk"], metadata={"chunk_index": i})
         for i, entry in enumerate(embeddings, start=1)
     ]