elasticsearch聚合函数

计算每个tag下的商品数量

GET /ecommerce/product/_search

{

"aggs": {  //聚合

"group_by_tags": { //聚合任意名字

"terms": { "field": "tags" }  //terms分组字段得到分组数量

}

}

}

对名称中包含yagao的商品，计算每个tag下的商品数量

GET /ecommerce/product/_search

{

"size": 0,

"query": {

"match": {

"name": "yagao"

}

},

"aggs": {

"all_tags": {

"terms": {

"field": "tags"

}

}

}

}

先分组，再算每组的平均值，计算每个tag下的商品的平均价格

GET /ecommerce/product/_search

{

"size": 0,

"aggs" : {

"group_by_tags" : {

"terms" : { "field" : "tags" },

"aggs" : {

"avg_price" : {  //起分组名字

"avg" : { "field" : "price" }  //avg聚合函数

}

}

}

}

}

计算每个tag下的商品的平均价格，并且按照平均价格降序排序

GET /ecommerce/product/_search

{

"size": 0,

"aggs" : {

"all_tags" : {

"terms" : { "field" : "tags", "order": { "avg_price": "desc" } },

"aggs" : {

"avg_price" : {

"avg" : { "field" : "price" }

}

}

}

}

}

按照指定的价格范围区间进行分组，然后在每组内再按照tag进行分组，最后再计算每组的平均价格

GET /ecommerce/product/_search

{

"size": 0,

"aggs": {

"group_by_price": {

"range": {

"field": "price",

"ranges": [

{

"from": 0,

"to": 20

},

{

"from": 20,

"to": 40

},

{

"from": 40,

"to": 50

}

]

},

"aggs": {

"group_by_tags": {

"terms": {

"field": "tags"

},

"aggs": {

"average_price": {

"avg": {

"field": "price"

}

}

}

}

}

}

}

}