Details
Major Description
Need to investigate possibility of pure lucene implementation of filtered navigation.
http://blog.mikemccandless.com/2012/03/new-index-statistics-in-lucene-40.html
IndexReader reader = IndexReader.open(index);
TermEnum terms = reader.terms();
Set<String> uniqueTerms = new HashSet<String>();
while (terms.next()) {
final Term term = terms.term();
if (term.field().equals("field_name"))
}