ElasticSearch对象数组聚合操作

如果我们的文档对象结构如下：

{
    "id":"123",
     "sex":"male",
     "extra":[
          {
           "name":"chinese",
           "score":100,
           "important":"high"
          },
          {
           "name":"english",
           "score":70,
           "important":"low"
          },
          {
           "name":"math",
           "score":90,
           "important":"highest"
          }
   ]
}，
{
    "id":"456",
     "sex":"female",
     "extra":[
          {
           "name":"chinese",
           "score":80,
           "important":"high"
          },
          {
           "name":"english",
           "score":60,
           "important":"low"