I would like to propose releasing Lucene/Solr 5.5.4 in order to address
both https://issues.apache.org/jira/browse/LUCENE-7647 and
https://issues.apache.org/jira/browse/LUCENE-7657 like for the 6.4.1
I propose to start building a RC after 6.4.1 is out in order to not have to
RCs running at the same time, which means we could hopefully build the
first RC early next week.