The new API for creating write concerns (added in v1.12.0) only includes a single way to create a write concern with w:majority: the writeconcern.Majority convenience function. If users want to define a write concern literal for w:majority, ..., they have to define their own string:

j := true
writeConcern := writeconcern.WriteConcern{
	W:       "majority",
	Journal: &j,
}

or use the Majority function to get the "w" field:

writeConcern := &writeconcern.WriteConcern{
	W:       writeconcern.Majority().W,
	Journal: writeconcern.Journaled().Journal,
}

Definition of done:

• Create a way to define a write concern literal for w:majority, ... without using a literal string or the Majority function.