We should upgrade to shindig 2.5.x, which doesn't seem too complicated: https://svn.apache.org/repos/asf/shindig/tags/shindig-project-2.5.0/UPGRADING
Shindig 2.0.x depends on Guava APIs that were removed starting with version 13, we won't be able to update our Guava dependency past this version until we upgrade shindig.