字段运算后聚合结果为0 #791
Description
比如：
SELECT SUM(Rcvd + Sent) AS CNT FROM fire
生成的脚本为：
{ "from": 0, "size": 0, "_source": { "includes": [ "SUM" ], "excludes": [] }, "aggregations": { "CNT": { "sum": { "script": { "source": " def add_1765017519 = doc['Rcvd'].value + doc['Sent'].value", "lang": "painless" } } } } }
查询结果为 0 ，生成的脚本是否缺少 return add_1765017519；?
因为有结果的脚本：
SELECT (Rcvd + Sent) AS CNT FROM fire
生成的脚本为：
{ "from": 0, "size": 200, "_source": { "includes": [], "excludes": [] }, "script_fields": { "CNT": { "script": { "source": " def add_119484767 = doc['Rcvd'].value + doc['Sent'].value;return add_119484767;", "lang": "painless" }, "ignore_failure": false } } }