Mongoid's #upsert method misuses the driver's #update_one method, because Mongoid actually provides a replacement document hence should use #replace_one, not #update_one. This was flagged by the change in https://jira.mongodb.org/browse/RUBY-2996.

This change should be backported as far back as is practical (for example through 7.3) so that when driver 2.18 is released with a warning for https://jira.mongodb.org/browse/RUBY-2996, users can update their Mongoid versions within each minor release to not have Mongoid-originated warnings.

Note that this ticket does not change behavior - Mongoid will use continue performing a replacing upsert and but will do it correctly via replace_one instead of incorrectly via update_one. Changing to an updating upsert is covered by https://jira.mongodb.org/browse/MONGOID-5363.