在REST API中求和两个int变量

Question

我想在REST API中总结两个整数变量，如下所示：

"aggs": {  
    "download1" : {
        "filter" : { "term": { "IPV4_DST_ADDR":"120.127.160.91"} },
        "aggs" : {
            "downlod_bytes" : { "sum" : { "field" : "IN_BYTES" } }
        }
    },
    "download2" : {
        "filter" : { "term": { "IPV4_SRC_ADDR":"120.127.160.91"} },
        "aggs" : {
            "downlod_bytes" : { "sum" : { "field" : "OUT_BYTES" } }
        }
    },"upload1" : {
        "filter" : { "term": { "IPV4_DST_ADDR":"120.127.160.91"} },
        "aggs" : {
            "upload_bytes" : { "sum" : { "field" : "OUT_BYTES" } }
        }
    },"upload2" : {
        "filter" : { "term": { "IPV4_SRC_ADDR":"120.127.160.91"} },
        "aggs" : {
            "upload_bytes" : { "sum" : { "field" : "IN_BYTES" } }
        }
    }
}   

将download1添加到download2并将upload1添加到upload2 我怎么办？

非常感谢！