title: How could I know which keyword matches on fulltext search in sunspot?
body: <p>I'm using rails + sunspot, and using:</p>
  
  <pre><code>Post.search do
      fulltext keywords, minimum_match: 1
  end
  </code></pre>
  
  <p>to match the post contain any keyword in the keywords list.</p>
  
  <p>the issue is, I want to know which keyword matches. Is there anyway to do this?</p>