Rails 4: RSolr::Error::Http (RSolr::Error::Http - 404 Not Found

error.solr-404.sh

1) stopping all running solr processes
2) removing the solr folder BUT keep a copy of it accessible in case you need some of the old config, synonyms and such.
3) gem uninstall all related gems
  > for i in `gem list --no-versions`; do gem uninstall -aIx $i; done
4) bundle install
5) rails generate sunspot_rails:install



fontes: 
  http://stackoverflow.com/questions/20304160/rails-4-rsolrerrorhttp-rsolrerrorhttp-404-not-found
  http://stackoverflow.com/questions/8095209/uninstall-all-installed-gems-in-osx