def test_mlt_on_foo_no_s(self):
        """Verify MLT with the foo field."""
        index = self.get_s().get_indexes()[0]
        doc_type = self.get_s().get_doctypes()[0]
        es = self.get_s().get_es()

        mlt = MLT(1, mlt_fields=['foo'], index=index, doctype=doc_type,
                  es=es, min_term_freq=1, min_doc_freq=1)
        eq_(len(mlt), 4)