All I can tell you is that it should work with the default options of Luke. Maybe just enable “read-only”, and double-check you are selecting the right directory. I know the GUI used to be really disturbing; if I remember correctly you had to first select the parent directory, then the index directory, then click “OK”.
I am using lucene 5.5.4 and luke v8.0.0
i am facing same issue. will you please suggest luke version for lucene 5.4.4
and also from where to download luke