lusis/chef-logstash — pull request #9 by richardc (2012-07-04 10:42:37+00:00)
Title: Widen the role: search to roles:

role:example means the role needs to be in the nodes top-level runlist, where
roles:example will search the expanded runlist, which fits our house style.

http://wiki.opscode.com/display/chef/Search#Search-FindNodeswithaRoleintheExpandedRunList