SolrCloud Configuration Disabled /sql Request Handler

The Solr configuration in all solrconfig.xml files has been changed for security reasons, and now disables the /sql request handler. This handler was never used but it was enabled implicitly in SolrCloud installations. You can ignore this release note, if you don't use SolrCloud.

Follow Section, “SolrCloud Configuration Disabled /sql Request Handler” for upgrade information.

(CMS-22172)