Summary

As part of the stepDown process, all current operations are killed and this would include an initial sync which is in progress.

Justification

Although, it is possible to modify the sync source for an initial sync at startup as of 3.4, once an initial sync is running, we are unable to change the sync source.  If a primary is under load with an initial sync running, it may be desirable for a customer to want to elect another primary leaving the initial sync running against the original primary node.