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                # Coerce(強制類型轉換) 數據不總是干凈的.根據它的生成方式,一個數字可能會在?**`JSON body?`**中呈現為一個真正的?**JSON?**數字。例如5,但它也可能呈現為字符串,例如?**"5"?**。或者,應該是整型的數字被替代地呈現為浮點型.例如,?**5.0?**或者?**"5.0"**. **`Coercion`**?嘗試著清理臟數據讓字段符合相應的數據類型.例如 : * 字符串被強制轉換為數字. * 浮點型被截斷為整型. 例如?**:** | `curl -XPUT?``'localhost:9200/my_index?pretty'`?`-H?``'Content-Type: application/json'`?`-d'` `{` `"mappings"``: {` `"my_type"``: {` `"properties"``: {` `"number_one"``: {` `"type"``:?``"integer"` `},` `"number_two"``: {` `"type"``:?``"integer"``,` `"coerce"``:?``false` `}` `}` `}` `}` `}` `'` `curl -XPUT?``'localhost:9200/my_index/my_type/1?pretty'`?`-H?``'Content-Type: application/json'`?`-d'` `{` `"number_one"``:?``"10"`??`(``1``)` `}` `'` `curl -XPUT?``'localhost:9200/my_index/my_type/2?pretty'`?`-H?``'Content-Type: application/json'`?`-d'` `{` `"number_two"``:?``"10"`??`(``2``)` `}` `'` | | 1 | `number_one`?字段會包含整型?`10`. | | 2 | `document`(文檔)會拒絕因為`coercion`是關閉的. | Tip **coerce**?配置允許在相同的索引中具有相同名稱的字段有不同的配置.可以通過[PUT mapping API](https://www.elastic.co/guide/en/elasticsearch/reference/5.3/indices-put-mapping.html)來更新已存在字段上的?**coerce**?值. ## Index-level default(索引級別的默認參數) **`index.mapping.coerce`?**配置可以在?**index level**(索引級別)來設置,以便在所有的?**`Mapping Types`**?全局關閉?**`coercion?`**`配置`. | `curl -XPUT?``'localhost:9200/my_index?pretty'`?`-H?``'Content-Type: application/json'`?`-d'` `{` `"settings"``: {` `"index.mapping.coerce"``:?``false` `},` `"mappings"``: {` `"my_type"``: {` `"properties"``: {` `"number_one"``: {` `"type"``:?``"integer"``,` `"coerce"``:?``true` `},` `"number_two"``: {` `"type"``:?``"integer"` `}` `}` `}` `}` `}` `'` `curl -XPUT?``'localhost:9200/my_index/my_type/1?pretty'`?`-H?``'Content-Type: application/json'`?`-d'` `{?``"number_one"``:?``"10"`?`}(``1``)` `'` `curl -XPUT?``'localhost:9200/my_index/my_type/2?pretty'`?`-H?``'Content-Type: application/json'`?`-d'` `{?``"number_two"``:?``"10"`?`}(``2``)` `'` | | 1 | **`number_one`**?字段覆蓋了?**index level**(索引級別)的設置并開啟了?**`coercion`**. | | 2 | **`document`**(文檔)會拒絕請求,因為?**`number_two`**?字段繼承了?**`index-level(索引級別)?``coercion`**的設置. |
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