我想将rdb-sql转换为elasticsearch查询

Question

我想将sql转换为elasticsearch查询

我尝试使用内部匹配，但这并不容易。

例如Example.sql

select parent.key
     , count(child.key) as cnt
  from Docu parent
  left join Docu child
    on parent.key = child.parentKey
 group by parnet.key
 order by cnt desc

请...