The db.currentOp shell command previously ran the currentOp server command. This patch changed it to run an aggregate command with the $currentOp stage.
Description of Linked Ticket
There are several limitations with db.currentOp(), including the documented 16MB result set size. There have been various testing issues because of this, such as
SERVER-47513 where the command gets truncated due to the size of the response.
Scope of changes
Impact to Other Docs
MVP (Work and Date)
Resources (Scope or Design Docs, Invision, etc.)