[eredmond]

"Based on distributed Solr" might be an over simplification. It uses Solr as its indexing engine, but really, that engine could be any single-node indexer... including single ES nodes. Basically, Yokozuna adds real grownup distributed systems computer science to the OSS distributed search space. http://docs.basho.com/riak/2.0.0beta1/dev/advanced/search/

[lobster_johnson]

To me, the Yokozuna "mediator" seems highly specific to Solr. It's not like you could swap out Solr for ES with just a little glue code, I think?