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                ## Filter Aggregation(過濾器聚合) 定義當前文檔集上下文中與指定過濾器匹配的所有文檔的單個bucket(桶)。 通常這將用于將當前聚合上下文縮小到一組特定的文檔。 例子: | `POST /sales/_search?size=0` `{` `"aggs" : {` `"t_shirts" : {` `"filter" : { "term": { "type": "t-shirt" } },` `"aggs" : {` `"avg_price" : { "avg" : { "field" : "price" } }` `}` `}` `}` `}` | 在上面的例子中,我們計算了type(類型)為t-shirt的所有產品的平均價格。 響應結果: | `{` `...` `"aggregations" : {` `"t_shirts" : {` `"doc_count" : 3,` `"avg_price" : { "value" : 128.33333333333334 }` `}` `}` `}` |
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