title: Why the elasticsearch highlight did not work?
body: <p>I try to highlight the result of my searching using elasticsearch. Unfortunately, somehow it did not work.</p>
  
  <p>This is my code:</p>
  
  <pre><code>def page_results(request, page_id):
  s = Search(using=Elasticsearch())
  keyword = request.GET.get('q')
  if keyword:
      posts = s[start:end].query(
          "multi_match",
          query=keyword,
          fields=['head_title^4', 'description^3','url^5', 'description.ngram'],
      )
      posts = posts.highlight('description')
  </code></pre>