aparo/pyes — pull request #422 by julianhille (2014-07-07 18:43:53+00:00)
Title: Added missing aggregation 'missing' and test for it

i missed the "missing" aggregation.
Added the class and also a test for it.

http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-aggregations-bucket-missing-aggregation.html