Parent object in fields result

[eugeis]

Hello,

I implemented parent support for elasticsearch-head. Now if parent exists for a type, the parent _source fields are displayed in the browser table. (https://github.com/eugeis/elasticsearch-head/commit/9cf167a105abf420976745ac178ae07c3be1740a)

But in the current implementation, I have to collect from first result all parent ids and parent types and then send a second "mget" request in order to get parent objects and then integrate it in the first result.

It would be nice have similar to "fields { "_parent" } definition in search request also like "fields { "_parent_object" } to get the parent object itself.

What do you think?

Thanks

[clintongormley]

Closing in favour of #761.