Terms aggregation on keyword array

Hi guys,
I have a field which is keyword array:


if I do terms aggregation on this field, I will get

"A" : 3
"B" : 2

is there any way that can make the combination as the bucket key in result?

"A" : 2
"B" : 1
"A"&"B": 1


I don't think you can with the current data structure.

What about generating instead:

"foo": "A"
"foo": "A"
"foo": "B"
"foo": "A&B"

That way you'll get back:

"A": 2
"B": 1
"A&B": 1

That being said, you can may be generate such a thing at search time (with a cost) using a painless script. See https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-bucket-terms-aggregation.html#search-aggregations-bucket-terms-aggregation-script

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