title: How does Lucene compute multifield score?
body: <p>Here's Lucene scoring equation:</p>
  
  <p>score(q,d)   =  coord(q,d) · queryNorm(q)  ·  ∑  ( tf(t in d)  · idf(t)2 · t.getBoost() · norm(t,d)  )  </p>
  
  <p>What about multifield scoring?</p>
  
  <p>Does the score gets directly summed or averaged or..?</p>