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                ## Nested Aggregation 一個特殊的single bucket(單桶)聚合,可以聚合嵌套的文檔 例如,假設我們有一個產品的索引,并且每個產品都包含一個分銷商列表——每個產品都有自己的價格。映射可能是: | `{` `...` `"product" : {` `"properties" : {` `"resellers" : { #1` `"type" : "nested",` `"properties" : {` `"name" : { "type" : "text" },` `"price" : { "type" : "double" }` `}` `}` `}` `}` `}` | #1 resellers是一個在product對象下保存嵌套文檔的數組。 以下匯總將返回可以購買的最低價格產品: | `{` `"query" : {` `"match" : { "name" : "led tv" }` `},` `"aggs" : {` `"resellers" : {` `"nested" : {` `"path" : "resellers"` `},` `"aggs" : {` `"min_price" : { "min" : { "field" : "resellers.price" } }` `}` `}` `}` `}` | 如上所述,嵌套聚合需要頂層文檔中嵌套文檔的路徑。 然后可以在這些嵌套文檔上定義任何類型的聚合。 響應結果: | `{` `"aggregations": {` `"resellers": {` `"min_price": {` `"value" : 350` `}` `}` `}` `}` |
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