[keycloak-user] How to add Admin User

Hi, I would like to summary information about How to add Admin User - chapter 3.2.1. My questions are: 1.) From which version (including) is new concept, that there is no built in user? 2a.) What is exact command via add-user script (add-user.sh) for create admin user ? 2b.) Same question like in 2a, but in keycloak-overlay (add-user-keycloak.sh )? Thanks and Best Regards, Andrej.