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                # Missing Aggregation 原文鏈接 : [https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-bucket-missing-aggregation.html](https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-bucket-missing-aggregation.html) 譯文鏈接 : [Missing Aggregation](http://apache.wiki/display/Elasticsearch/Missing+Aggregation?src=contextnavpagetreemode) 貢獻者 : @于永超,[ApacheCN](/display/~apachecn),[Apache中文網](/display/~apachechina) ## Missing Aggregation 基于字段數據的單桶聚合,創建當前文檔集上下文中缺少字段值的所有文檔的bucket(桶)(有效地,丟失了一個字段或配置了NULL值集),此聚合器通常與其他字段數據桶聚合器(例如范圍)結合使用,以返回由于缺少字段數據值而無法放置在任何其他存儲區中的所有文檔的信息。 例子: ``` { "aggs" : { "products_without_a_price" : { "missing" : { "field" : "price" } } } } ``` 在上面的例子中,我們得到了沒有價格的產品總數。 ``` { ... "aggs" : { "products_without_a_price" : { "doc_count" : 10 } } } ```
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