Update app.py

app.py

@@ -49,7 +49,7 @@ def get_matches(query, db_name="miread_contrastive"):
     """
     Wrapper to call the similarity search on the required index
     """
-    matches = vecdbs[index_names.index(
+    matches = vecdbs[INDEXES.index(
         db_name)].similarity_search_with_score(query, k=60)
     return matches