protected boolean isCleanerSupported() {
        return true;
    }
Indicates whether the registry supports automated ticket cleanup.
Generally, a registry that is able to return a collection of available
tickets should be able to support the cleanup process. Default is {@code true}.

@return true/false.
core/cas-server-core-tickets-api/src/main/java/org/apereo/cas/ticket/registry/DefaultTicketRegistryCleaner.java