Mike McCandless gives a good overview here: http://blog.mikemccandless.com/2012/07/lucene-400-alpha-at-long-last.html http://blog.mikemccandless.com/2012/07/luc

Mike McCandless gives a good overview here: http://blog.mikemccandless.com/2012/07/lucene-400-alpha-at-long-last.html http://blog.mikemccandless.com/2012/07/lucene-400-alpha-at-l... He has some other posts on there that do a deeper dive as well.