Upgrading from SolrCloud 4.x to 4.y - as if you had used 4.y all along

[Per Steffensen]

If you are upgrading from SolrCloud 4.x to a later version 4.y, and 
basically want your end-system to seem as if it had been running 4.y (no 
legacy mode or anything) all along, you might find some inspiration here

http://solrlucene.blogspot.dk/2014/01/upgrading-from-solrcloud-4x-to-4y-as-if.html