[keycloak-user] How to get UserRepresentation by subject id

I remember reading that the correct way to uniquely identify a keycloak user is by the subject id. That is what I associate with objects in my application. I need to get a UserRepresentation using the admin client by that subject id. However, the only option allowed is to use username. Ex. realm.users().get("username"). I need realm.users().get("subjectid"). Is there a way to get UserRepresentation by subject?