概述
继续跟中华石杉老师学习ES，第35篇
课程地址： https://www.roncoo.com/view/55
官方指导
Metrics Aggregations
- count：bucket，terms，自动就会有一个doc_count，就相当于是count
- avg：avg aggs，求平均值
- max：求一个bucket内，指定field值最大的那个数据
- min：求一个bucket内，指定field值最小的那个数据
- sum：求一个bucket内，指定field值的总和
太多了，挑几个常用的说吧
Min Aggregation
Min Aggregation ： 戳这里
Max Aggregation
Max Aggregation ： 戳这里
Sum Aggregation
Sum Aggregation： 戳这里
案例：统计每种颜色电视最大最小价格
原始数据：
DSL:
代码语言：javascript复制#统计每种颜色电视最大最小价格
GET /tvs/sales/_search
{
"size": 0,
"aggs": {
"colors": {
"terms": {
"field": "color"
},
"aggs": {
"avg_price": {
"avg": {
"field": "price"
}
},
"min_price": {
"min": {
"field": "price"
}
},
"max_price": {
"max": {
"field": "price"
}
},
"sum_price": {
"sum": {
"field": "price"
}
}
}
}
}
}返回：
代码语言：javascript复制{
"took": 4,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"skipped": 0,
"failed": 0
},
"hits": {
"total": 8,
"max_score": 0,
"hits": []
},
"aggregations": {
"color": {
"doc_count_error_upper_bound": 0,
"sum_other_doc_count": 0,
"buckets": [
{
"key": "红色",
"doc_count": 4,
"max_price": {
"value": 8000
},
"min_price": {
"value": 1000
},
"avg_price": {
"value": 3250
},
"sum_price": {
"value": 13000
}
},
{
"key": "绿色",
"doc_count": 2,
"max_price": {
"value": 3000
},
"min_price": {
"value": 1200
},
"avg_price": {
"value": 2100
},
"sum_price": {
"value": 4200
}
},
{
"key": "蓝色",
"doc_count": 2,
"max_price": {
"value": 2500
},
"min_price": {
"value": 1500
},
"avg_price": {
"value": 2000
},
"sum_price": {
"value": 4000
}
}
]
}
}
}
