It looks like there's no way to avoid outputting fields like _id, _type,
_index etc when getting a search result back. I have a usecase where I want
to retrieve one script-fields on a result list of around 20,000 items. The
output is around 5 times bigger that it could be, if I could avoid sending
the _id, _type, etc.
Is this a planned feature in upcoming releases of ES?
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