Update app.py

app.py

@@ -237,7 +237,8 @@ def load_models_and_documents():
         },
         2,
         optimizers_config=models.OptimizersConfigDiff(
-            indexing_threshold=0
+            indexing_threshold=0,
+            default_segment_number=8
         ),
         hnsw_config=models.HnswConfigDiff(
             on_disk=False,