Crown election means the choice of the crown prosecutor to prosecute a summary offence by summary conviction procedure or indictment.
All criminal offences in Canada are either summary offences, indictable offences, or hybrid offences. Most crimes are hybrid offences. For hybrid offences the crown prosecutor will choose ('elect') to proceed by summary or not. If the crown does not elect, or elects by indictment, then you will be facing an indictable offence.