I'm particularly excited about the inclusion of Lucene 6's KD trees, allowing for up to 8-dimensional geometric search. Normally you'd use that for geolocation

I'm particularly excited about the inclusion of Lucene 6's KD trees, allowing for up to 8-dimensional geometric search. Normally you'd use that for geolocation stuff, which is fine, but I'm excited about the possible applications for using it to index document embeddings!