ElasticSearch 2.x parent-child performance

In the definite guide here - https://www.elastic.co/guide/en/elasticsearch/guide/current/parent-child-performance.html - there is a statement that the performance of parent-child queries can be 5-10 times slower than nested queries.

It says that there are plans to use doc values instead, for better performance. Is there an improvement on this area in 2.x


See https://github.com/elastic/elasticsearch/pull/6511. There are improvements, but parent/child is still much slower than nested queries, which are themselves much slower than regular queries.

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