Check the given argument parameter to decide if highlights needed.

        argument value is expected to be '0' or '1'

def should_highlight(self, req):
        """
        Check the given argument parameter to decide if highlights needed.

        argument value is expected to be '0' or '1'
        """
        try:
            return bool(req.args and int(req.args.get('es_highlight', 0)))
        except (AttributeError, TypeError):
            return False