: Thanks, I should have checked the wiki. it's also called out in the "Upgrading from Solr 1.1" section of the CHANGES.txt file...
http://svn.apache.org/repos/asf/lucene/solr/trunk/CHANGES.txt ... The JSON response format for facets has changed to make it easier for clients to retain sorted order. Use json.nl=map explicitly in clients to get the old behavior, or add it as a default to the request handler in solrconfig.xml -Hoss
