if its not stated as "this feature is going to Lucene"
It seems as though some people assume that since Lucene is a library, and Solr is an application, that exposing Solr API *means* making it part of Lucene. It ain't necessarily so, and it need not be a point of contention.
I want to reiterate my opinion (voiced pre-merge) that there be a third entity here besides Solr and Lucene.
E.g., if "modules/" became "thirdentity/", with its own org.apache.thirdentity namespace, wouldn't questions of ownership/control mostly go away?