ElasticSearch test expression script with aggregation

create_entries.json

{
  "testVal": 25,
  "testQuantity": 5
}

mapping.json

{
	"mappings" : {
		"test" : {
			"properties" : {
				"testVal" : { "type" : "long", "index" : "not_analyzed" },
				"testQuantity" : { "type" : "long", "index" : "not_analyzed" }
			}
		}
	}
}

query.json

{
  "aggs": {
    "testAgg": {
      "sum": {
        "lang": "expression",
        "script": "doc['testVal'].value * doc['testQuantity'].value"
      }
    }
  }
}

urls

mapping:
  http://localhost:9200/test/test/ PUT

create_entries:
  http://localhost:9200/test/test/ POST
  
query:
  http://localhost:9200/test/test/_search?search_type=count POST