Retryable writes may not work properly when performed on a shard involved as originator of a movePrimary operation. In this scenario, insert operations could be performed twice causing duplica key errors.
 
This is a known bug (SERVER-32113) which will be resolved in the context of the Online movePrimary project. The goal of this ticket is to implement a workaround to initializate the document snapshot of some collections using in move_primary_with_crud.js. A temporary solution (valid for this ticket) could be ignore these errors.