Update app.py

app.py

@@ -44,7 +44,7 @@ def retrieve_answer(question, goals, session_key):
 def namespace_check(arg):
     pc = pc_connector._connection()
     index = pc.Index(conf["embeddings"]["index_name"])
-    stats = index.DescribeIndexStats()
+    stats = index.describe_index_stats()
     name_list = stats['namespaces'].keys()
     arg in name_list
     return arg in name_list