Query DSL- Exists Query

Exists Query

存在查询

Returns documents that contain an indexed value for a field.

返回字段中包含索引值的文档。

An indexed value may not exist for a document’s field due to a variety of reasons:

由于多种原因，索引值可能不存在于文档的字段中：

• The field in the source JSON is null or []

• The field has "index" : false set in the mapping

• The length of the field value exceeded an ignore_above setting in the mapping

• The field value was malformed and ignore_malformed was defined in the mapping

• 源JSON中的字段是null或[]

• 字段在mapping中设置为"index" : false

• 字段值的长度超出了mapping中设置的ignore_above

• 字段值格式错误，并且mapping中设置的了ignore_malformed

Example requestedit

GET /_search
{
    "query": {
        "exists": {
            "field": "user"
        }
    }
}

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Top-level parameters for exists

exists的一级参数

• field

  (Required, string) Name of the field you wish to search.

  （必需，字符串）您要搜索的字段的名称。

  While a field is deemed non-existent if the JSON value is null or [], these values will indicate the field does exist:

  如果JSON值为null或[]，则认为该字段不存在，下面这些值被认为字段存在：

  • Empty strings, such as "" or "-"

  • Arrays containing null and another value, such as [null, "foo"]

  • A custom null-value, defined in field mapping

  • 空字符串，例如""或"-"

  • 包含null和另一个值的数组，例如[null, "foo"]

  • 在mapping中设置的自定义null-value

Notes

Find documents missing indexed values

查找缺少索引值的文档

To find documents that are missing an indexed value for a field, use the must_not boolean query with the exists query.

要查找字段缺少索引值的文档，请在must_not 布尔查询 中使用exists查询。

The following search returns documents that are missing an indexed value for the user field.

以下搜索返回字段中缺少user索引值的文档。

GET /_search
{
    "query": {
        "bool": {
            "must_not": {
                "exists": {
                    "field": "user"
                }
            }
        }
    }
}

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