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                # 值計數聚合(Value Count Aggregation) single-value 度量聚合就是計算從文檔中 提取/獲取(extracted)的值的數量。這些值可以從文檔指定的 字段/屬性(field)中提取,或者從給定的腳本中生成。特別的(Typically),該聚合器可以與其他single-value聚合結合使用。例如,當計算一個對計算得到的平均值的值的數量感興趣的`avg`查詢時。 | `POST /sales/_search?size=``0` `{` `"aggs"`?`: {` `"types_count"`?`: {?``"value_count"`?`: {?``"field"`?`:?``"type"`?`} }` `}` `}` | 響應(Response): | `{` `...` `"aggregations"``: {` `"types_count"``: {` `"value"``:?``7` `}` `}` `}` | 聚合的名字(type_count 上面)也作為key使聚合結果可以從響應中重新獲取。 # 腳本(Script) 計算腳本生成的值: | `POST /sales/_search?size=``0` `{` `"aggs"`?`: {` `"type_count"`?`: {` `"value_count"`?`: {` `"script"`?`: {` `"inline"`?`:?``"doc['type'].value"` `}` `}` `}` `}` `}` | 這將使用`painless` 腳本語言將 script 參數解釋為內聯腳本,沒有腳本參數。使用如下的語法來使用文件腳本(file script): | `POST /sales/_search?size=``0` `{` `"aggs"`?`: {` `"types_count"`?`: {` `"value_count"`?`: {` `"script"`?`: {` `"file"``:?``"my_script"``,` `"params"`?`: {` `"field"`?`:?``"type"` `}` `}` `}` `}` `}` `}` | 提示:對于索引腳本需要將file參數替換為id參數。
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