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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.