The donorSplit operation was renamed which lead to command being renamed. An override was added for the old command names as it led to test failures in multiversion test.

When we'll be at 5.3, it will be possible to remove these overrides as the old commands won't be available anymore. Remove :

donorAbortSplit
donorForgetSplit

donorStartSplit

from view_all_commands.js and read_write_concern_defaults_application.js