title: Mongo unique index case insensitive
body: <pre><code>@CompoundIndexes({
      @CompoundIndex(name = "fertilizer_idx",
          unique = true,
          def = "{'name': 1, 'formula': 1, 'type': 1}")
  })
  public class Fertilizer extends Element implements Serializable {
  //class stuff
  }
  </code></pre>
  
  <p>Is it possible to create the index case insensitive? Right now it is differentiating from <code>NAME</code> to <code>NAMe</code>. Saving a second field lowercase (or uppercase) is not a possibility for me.</p>
  
  <p>Thanks,
  Pedro</p>