docs: protected String handleAbstractTicketException(final AbstractTicketException e, final RequestContext requestContext) {
          val messageContext = requestContext.getMessageContext();
          val match = this.errors.stream()
              .filter(c -> c.isInstance(e)).map(Class::getSimpleName)
              .findFirst();
  
          match.ifPresent(s -> messageContext.addMessage(new MessageBuilder().error().code(e.getCode()).build()));
          return match.orElse(UNKNOWN);
      }