We don't want unslugged urls to be indexed.
To find offending namespaces:

> Blacklight.solr.select(params: {q: 'id:*', fl: 'id', rows: '100000'})['response']['docs'].map{|x| x['id']}.grep(/:/).map{|x| x.gsub(/:.*/,'')}.uniq
 => ["changeme", "openvault", "org.wgbh.mla"]
Merge pull request #881 from afred/no-spidering-of-unslugged

We don't want unslugged urls to be indexed.