Nik Everett e3f77b4795 Replace AggregatorParsers with namedObject (#22397)
Removes `AggregatorParsers`, replacing all of its functionality with
`XContentParser#namedObject`.

This is the third bit of payoff from #22003, one less thing to pass
around the entire application.
2017-01-09 13:59:38 -05:00
..