boto/boto — pull request #1488 by jcinis (2013-05-10 19:24:45+00:00)
Title: Added Rank Expressions to CloudSearch Requests

Adding a rank_expressions dictionary to any passed Query object will allow
for non-stored Rank Expressions to be added to the search.

This feature is defined by AWS here:
http://docs.aws.amazon.com/cloudsearch/latest/developerguide/rankexpressionquery.html