mozilla/elasticutils — pull request #98 by mythmon (2013-02-04 23:52:05+00:00)
Title: [Issue 97] Add logic to filter by None.

ElasticSearch doesn't really allow filtering by None, instead you have to make a filter that asks "is this field missing?". Weird. This turns `key=None` filters into `"missing": {"field": "key"}` queries.