title: Lucene Boolean value search with boolean query
body: <p>There is a field say XYZ with value as either TRUE or FALSE. 
  i am searching as following</p>
  
  <pre><code>+Contents:risk +XYZ:TRUE
  </code></pre>
  
  <p>is it legal to search like that? i tried but it showed me results with FALSE value too.</p>
  
  <p>What was more amazing is that i searched by <code>+XYZ:[TRUE TO TRUE]</code> and it worked.</p>
  
  <p>can some one tell me what exactly is my mistake?</p>