Solr 6.4.2

For those trying Solr - version 6.4.2 fixed a number of bugs in the 6.4.x series. Speed is incredible. If you haven't tried it - I strongly recommend it!

And, using the included installation script (with Solr) combined with my schema - installation was painless. I'm now running in single core mode without issues (running in cloud mode with a single core seemed silly anyway).

-- Daniel