Breaking change: Rename Stage to Volume

Author: lentitude2tk

pymilvus/bulk_writer/volume_file_manager.py

@@ -139,7 +139,18 @@ def _validate_size(self):
             error_message = (
                 f"localFileTotalSize {file_size_total} exceeds "
                 f"the maximum contentLength limit {file_size_limit} defined in the condition."
-                f"If you want to upload larger files, please contact us to lift the restriction."
+                f"If you are using the free tier, "
+                f"you may switch to the pay-as-you-go volume plan to support uploading larger files."
+            )
+            raise ValueError(error_message)
+
+        file_number_limit = self.volume_info["condition"]["maxFileNumber"]
+        if file_number_limit and len(self.local_file_paths) > file_number_limit:
+            error_message = (
+                f"localFileTotalNumber {len(self.local_file_paths)} exceeds "
+                f"the maximum fileNumber limit {file_number_limit} defined in the condition."
+                f"If you are using the free tier, "
+                f"you may switch to the pay-as-you-go volume plan to support uploading larger files."
             )
             raise ValueError(error_message)