The issue may affect earlier versions as well. I've tried a dozen times using various ~docs and partial examples (there isn't a single clear example in the solr support docs) to get _nest_path_ working with DIH.
My parent/child documents are indexed as expected and using the DIH debugger I am able to see the child entities get mapped underneath a _childDocuments_ property. However when i go to query the documents I am unable to get child documents returned nested under the parent document. I've tried using various forms of 'fl=*,[child]' and '[child childFilter=<filter>]'. Also, no documents are returned when trying to query on the _nest_path_ directly using q=_nest_path_:*