Update the global highlighting options used for this request. For
        example::

            s = Search()
            s = s.highlight_options(order='score')

def highlight_options(self, **kwargs):
        """
        Update the global highlighting options used for this request. For
        example::

            s = Search()
            s = s.highlight_options(order='score')
        """
        s = self._clone()
        s._highlight_opts.update(kwargs)
        return s