public class StringSortComparator
This supplies a Low Memory variant of Lucene's StringOrdValComparator.
We have this modified class as we believe that most searches in very large JIRA installations
will return a very small portion of the document index, either because they are over only one of
many projects or they return only open issues, especially on dashboards and in GreenHopper and similar plugins as
well as in general navigator searches.