Update app.py

app.py

@@ -95,7 +95,7 @@ def answer_callback(question_query, word_count):
         print(list(zip(pdf_paths, pdf_citations)))
         for d, c in zip(pdf_paths, pdf_citations):
             docs.add(d, c)
-    docs._build_faiss_index()
+    docs._build_texts_index()
     answer = docs.query(question_query,  length_prompt=f'use {word_count:d} words')
     st.success('Voila! 😃')
     return answer.formatted_answer