elasticsearch/elasticsearch — pull request #4717 by bleskes (2014-01-14 01:48:41+00:00)
Title: excluding all fields of an object should not remove parent.

When excluding '*.f1' from `{ "obj": { "f1": 1, "f2": 2 } }` XContentMapValues.filter returns `{ "obj": { "f2": 2}}`. When run on `{ "obj": { "f1" : 1 }}` we should return `{ "obj": { }}` to maintain object structure. People currently need to always check whether `obj` is there or not.

Closes #4715
Closes #4047
Related to #4491