normalized fixed + in header text as well

index_retriever.py

@@ -20,8 +20,12 @@ def create_vector_index(documents):
         # Normalize text content for BM25
         if hasattr(doc, 'text'):
             from documents_prep import normalize_connection_type
-            doc.text = normalize_connection_type(doc.text)
-        
+            normalized_text = normalize_connection_type(doc.text)
+            # Create a new Document with normalized text and same metadata
+            doc = Document(
+                text=normalized_text,
+                metadata=doc.metadata
+            )
         processed_docs.append(doc)
         
         if doc.metadata.get('type') == 'table':