'Finds and returns results similar to the provided query.
Returns ``self.results_cls`` class object (defaults to
``pysolr.Results``)
Requires Solr 1.3+.
Usage::
similar = solr.more_like_this(\'id:doc_234\', \'text\')'

def more_like_this(self, q, mltfl, handler=u'mlt', **kwargs):

    params = {u'q': q, u'mlt.fl': mltfl}
    params.update(kwargs)
    response = self._mlt(params, handler=handler)
    decoded = self.decoder.decode(response)
    self.log.debug(u"Found    '%s'    MLT    results.", (decoded.get(u'response', {}) or {}).get(u'numFound', 0))
    return self.results_cls(decoded)
