How to sum two variable in REST API (script)

such as title, I want to sum two variable using script syntax.

such as sum download1+download2 and upload1+upload2:

"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" } }
        },
  "aggs":{
    "sum_bytes": {
      "sum": {
        "script": {
          "source": "download1 + download2"//sum two variable.but I don't know how to write correct code here.
        }
      }
     }
    }
   }

thank you in advance!

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