Raul,
Unfortunately, the terms_stats facet does not support scripting the terms
key. You can try aggregations (ES 1.0) or if you want to use term_stats
facet, you will need to introduce an extra field that is a combination of
product and campaign to your JSON documents.
{"total": 10,"product": 1,"campaign": 1,"product_campaign": "11"},
{"total": 10,"product": 1,"campaign": 2,"product_campaign": "12"},
{"total": 10,"product": 1,"campaign": 1,"product_campaign": "11"},
{"total": 10,"product": 2,"campaign": 1,"product_campaign": "21"}
And then
"x": {
"terms_stats": {
"key_field": [
"product_campaign"
],
"value_field": "total"
}
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