The repository.jboss.org Nexus repository indexes and the search features of the repository now seem to be working correctly.  We've had multiple problems in the past correctly generating repository indexes, but after upgrading to Nexus 1.9.0.2 and migrating away from our old audit plugin (now replaced by the standard Nexus upload tracking), the index generation works correctly.  The repository search also has an improved UI and seems significantly faster than our old Nexus configuration.