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