title: Which field type should I use to store true/false values?
body: <p>I want to store a boolean value, but not sure which field type to use.</p>
  
  <p>So something like this theoretically:</p>
  
  <p>doc.add(new ????("numeric", true)
  doc.add(new ????("alphatic", true)
  doc.add(new ????("alphanumeric", true)</p>
  
  <p>I will be querying using these boolean field types like:</p>
  
  <ol>
  <li>search where is numeric only</li>
  <li>search where is alphabetic only</li>
  <li>search where is alphanumeric</li>
  </ol>
  
  <p>Any comments on the best approach? (speed/effeciency is important ofcourse)</p>