Download the release zip here: https://github.com/DmitryKey/luke/releases/tag/luke-6.3.0
Upgrade to Lucene 6.3.0. #74 <https://github.com/DmitryKey/luke/pull/74> and, other changes in this release: <https://github.com/DmitryKey/luke/blob/luke-6.3.0/CHANGES.txt> Enjoy!
