Feature to support passing in the parent value via a field path during indexing, same as _id & _routing.

[govindm]

Currently I see that the _id & _routing can be extracted from the source/document by creating the mapping as below.

{
    "tweet" : {
       "_id" : {
            "path" : "post_id"
        }
    }
}

But _parent value can't be set this way.
Could you please add feature to support passing in the parent value via a field path during indexing, same as _id & _routing?

[govindm]

in case more info required please refrer to this thread.
https://groups.google.com/forum/?fromgroups=#!topic/elasticsearch/KSEf3FZPh64

[SimonSimCity]

👍 I needed that for one of my projects, where I use Couchbase and can just use the data I have inside the document ...

[clintongormley]

Closed in favour of #6730