Optional but strongly recommended for the best service
experience. If [update_mask][google.cloud.talent.v4beta1.Upd
ateApplicationRequest.update_mask] is provided, only the
specified fields in [application][google.cloud.talent.v4beta1.
UpdateApplicationRequest.application] are updated. Otherwise
all the fields are updated. A field mask to specify the
application fields to be updated. Only top level fields of
Application are
supported.