类似于sql语句中where子句的作用
{
"query": {
"match_all": {}
},
"aggs": {
"aggname": {
"filter": {
"range": {
"time-taken": {
"gt": 200
}
}
},
"aggs": {
"avg_size": {
"avg": {
"field": "time-taken"
}
}
}
}
},
"size": 20
}
原文：http://www.cnblogs.com/liuyuhua/p/5260709.html