title: Using FieldSelector when searching with Lucene
body: <p>I'm searching articles in PubMed via Lucene.
  Each of the 20,000,000 articles has an abstract with ~250 words and an ID.</p>
  
  <p>At the moment I store my searches, with each take multiple seconds, in a TopDocs object.
  Searchs can find thousands of articles.
  I'm just interested in the ID of the article.
  Does Lucene load the abstracts internally into the TopDocs?</p>
  
  <p>If so can I prevent that behavior through FieldSelectors or do FieldSelectors only work with IndexReader and don't work with IndexSearcher?</p>