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                # null_value(空值) **null?**值不能被索引或者搜索.當一個字段被設置成?**null**(或者一個空數組,或者值全為?**null?**的數組)時, 該字段將被視為沒有值。 **null_value?**參數允許你用一個特殊的值替換一個顯示的?**null?**值, 以確保這個字段能被索引和搜索。例如: | `curl -XPUT?``'localhost:9200/my_index?pretty'`?`-H?``'Content-Type: application/json'`?`-d'` `{` `"mappings"``: {` `"my_type"``: {` `"properties"``: {` `"status_code"``: {` `"type"``:???????``"keyword"``,` `"null_value"``:?``"NULL"`?`#1` `}` `}` `}` `}` `}` `'` `curl -XPUT?``'localhost:9200/my_index/my_type/1?pretty'`?`-H?``'Content-Type: application/json'`?`-d'` `{` `"status_code"``: null` `}` `'` `curl -XPUT?``'localhost:9200/my_index/my_type/2?pretty'`?`-H?``'Content-Type: application/json'`?`-d'` `{` `"status_code"``: []?``#2` `}` `'` `curl -XGET?``'localhost:9200/my_index/_search?pretty'`?`-H?``'Content-Type: application/json'`?`-d'` `{` `"query"``: {` `"term"``: {` `"status_code"``:?``"NULL"`?`#3` `}` `}` `}` `'` | | 1 | 用?**NULL?**代替顯示的?**null?**值。 | | 2 | 沒有顯示的包含?**null?**的空數組,不會被?**null_value?**替換。 | | 3 | 搜索?**NULL?**將返回文檔1,而不會返回文檔2。 | 重點 **null_value?**必須設置成相同類型的參數。例如,一個?**long?**型的字段不能被設置成?**string?**類型的?**null_value**。
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