is that actually solr or is it just lucene-based? I.e. do you use the same clients, schema, extension modules you'd use with normal solr?
"Yokozuna comes pre-bundled with Solr 4.0.0 running in the Jetty container." (they now bundle 4.1.0).
Source: https://github.com/rzezeski/yokozuna/blob/v0.3.0/docs/RELEAS...