Aggregation on fields within nested objects in elasticsearch

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2

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Please update your post.

The main question I have is why are you indexing an array of items if you actually want to compute items. Just indexing individual items is looking a better design to me but may be I don't have the full picture here.

So I'd index things like:

PUT items/_doc/1234
{
  "itemname": "1234",
  "quantityint": 2
} 
PUT items/_doc/1234
{
  "itemname": "1235",
  "quantityint": 2
}

Then creating a sum is quite easy I believe.