# 最大值聚合
最大值聚合是一個單值度量聚合,用來記錄和返回從聚合的文檔中提取出的數字型值中的最大值。這些值可以從文檔中的特定數字類型的字段提取,也可以通過腳本生成。
提示:最小值聚合和最大值聚合以數據的雙重表示方式進行操作。 因此,如果在絕對值大于2 ^ 53的long類型的字段上運行最大值聚合或者最小值聚合,結果可能是近似值。
計算所有文檔中價格最高的文檔:
|
`POST /sales/_search?size=``0`
`{`
`"aggs"`?`: {`
`"max_price"`?`: {?``"max"`?`: {?``"field"`?`:?``"price"`?`} }`
`}`
`}`
|
返回值:
|
`{`
`...`
`"aggregations"``: {`
`"max_price"``: {`
`"value"``:?``200.0`
`}`
`}`
`}`
|
可以看出,可以以聚合的名稱(max_price)作為關鍵字從返回的結果中查詢出聚合的結果。
## script
最大值聚合也可以通過腳本來計算,下面是一個計算最高價格的腳本的例子:
|
`POST /sales/_search`
`{`
`"aggs"`?`: {`
`"max_price"`?`: {`
`"max"`?`: {`
`"script"`?`: {`
`"inline"`?`:?``"doc.price.value"`
`}`
`}`
`}`
`}`
`}`
|
這會使用[Painless](https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-scripting-painless.html "Painless Scripting Language")?腳本語言,而且這個腳本沒有參數。如果想使用腳本文件,用下面的這種方式:
|
`POST /sales/_search`
`{`
`"aggs"`?`: {`
`"max_price"`?`: {`
`"max"`?`: {`
`"script"`?`: {`
`"file"``:?``"my_script"``,`
`"params"``: {`
`"field"``:?``"price"`
`}`
`}`
`}`
`}`
`}`
`}`
|
提示:索引腳本只需要將file參數替換為id參數。
## Value Script
比如index中的文檔里的價格是以美元為單位的,但是我們現在想獲得歐元的最大值(在這里假設匯率是1.2)。我們可以使用value script在聚合前來來實現每個值的匯率轉化:
|
`POST /sales/_search?`
`{?`
`"aggs"`?`: {?`
`"max_price_in_euros"`?`: {?`
`"max"`?`: {?`
`"field"`?`:?``"price"``,?`
`"script"`?`: {?`
`"inline"`?`:?``"_value * params.conversion_rate"``,?`
`"params"`?`: {?`
`"conversion_rate"`?`:?``1.2`?
`}?`
`}?`
`}?`
`}?`
`}?`
`}`
|
## Missing Value
missing參數定義了如何處理缺少值的文檔。 默認情況下如果沒有指定的字段,這種文檔將被忽略,但也可以認為它們具有指定的值。
|
`POST /sales/_search?`
`{?`
`"aggs"`?`: {?`
`"grade_max"`?`: {?`
`"max"`?`: {?`
`"field"`?`:?``"grade"``,?`
`"missing"``:?``10`??
`}?`
`}?`
`}?`
`}`
|
注釋1:文檔中如果沒有grade這個字段,則認為該字段的值是10。
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