Luke has some capabilities to look at the index at a low level,
perhaps that could give you some pointers. I think you can pull
the older branch from here:
https://github.com/DmitryKey/luke

or:
https://code.google.com/archive/p/luke/

NOTE: This is not a part of Lucene, but an independent project
so it won't have the same labels.

Best,
Erick

On Tue, Jan 2, 2018 at 2:06 AM, Dawid Weiss <[EMAIL PROTECTED]> wrote: