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                # Extended Stats Bucket Aggregation(擴展信息桶聚合) 警告 此功能是實驗性的,可能會在未來的版本中完全更改或刪除。Elastic將采取最大的努力來解決任何的問題,但是實驗功能不受SLA官方功能的支持。 同級管道聚合,它計算同級集合中指定度量的所有桶的各種統計信息。指定的度量必須是數字,同級聚合必須是多桶聚合。 與stats_bucket聚合相比,此聚合提供了更多的統計信息(平方和,標準偏差等)。 Syntax(語法) extendes_stats_bucket聚合看起來像這樣: ``` { "extended_stats_bucket": { "buckets_path": "the_sum" } } ``` ## Table?7.?`extended_stats_bucket`?Parameters(Table7.extended_stats_bucket參數) | 參數名稱 | 描述 | 是否必要 | 默認值 | | --- | --- | --- | --- | | `buckets_path` | 我們希望計算統計數據的桶的路徑(相關詳細信息,請參閱"buckets_path Syntax"一節) | 必須 | ? | | `gap_policy` | 在數據中找到差異時應用的策略(相關詳情,請參閱"Dealing with gaps in the data"一節) | 可選 | `skip` | | `format` | 應用于此聚合的輸出值的格式 | 可選 | `null` | | `sigma` | 要顯示的平均值之上/之下的標準偏差數 | 可選 | 2 | 以下代碼計算每月sales桶的擴展統計信息: ``` POST /sales/_search { "size": 0, "aggs" : { "sales_per_month" : { "date_histogram" : { "field" : "date", "interval" : "month" }, "aggs": { "sales": { "sum": { "field": "price" } } } }, "stats_monthly_sales": { "extended_stats_bucket": { "buckets_path": "sales_per_month>sales" #1 } } } } ``` | 1 | bucket_paths指示這個為extendes_stats_bucket聚合,我們希望在sales_per_month日期直方圖中計算sales聚合的統計信息。 | 以下是響應信息: ``` { "took": 11, "timed_out": false, "_shards": ..., "hits": ..., "aggregations": { "sales_per_month": { "buckets": [ { "key_as_string": "2015/01/01 00:00:00", "key": 1420070400000, "doc_count": 3, "sales": { "value": 550.0 } }, { "key_as_string": "2015/02/01 00:00:00", "key": 1422748800000, "doc_count": 2, "sales": { "value": 60.0 } }, { "key_as_string": "2015/03/01 00:00:00", "key": 1425168000000, "doc_count": 2, "sales": { "value": 375.0 } } ] }, "stats_monthly_sales": { "count": 3, "min": 60.0, "max": 550.0, "avg": 328.3333333333333, "sum": 985.0, "sum_of_squares": 446725.0, "variance": 41105.55555555556, "std_deviation": 202.74505063146563, "std_deviation_bounds": { "upper": 733.8234345962646, "lower": -77.15676792959795 } } } } ``` 原文鏈接 : [https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-pipeline-extended-stats-bucket-aggregation.html](https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-pipeline-extended-stats-bucket-aggregation.html)(修改該鏈接為官網對應的鏈接) 譯文鏈接 : [http://www.apache.wiki/pages/viewpage.action?pageId=10030368](http://www.apache.wiki/pages/viewpage.action?pageId=10030368)(修改該鏈接為 **ApacheCN** 對應的譯文鏈接) 貢獻者 : [曾少峰](/display/~zengshaofeng),[ApacheCN](/display/~apachecn),[Apache中文網](/display/~apachechina)
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