elasticsearch 创建 mapping

Dear 丶 2023-06-10 12:21 57阅读 0赞

Mapping is the process of defining how a document, and the fields it contains, are stored and indexed. For instance, use mappings to define:

*  which string fields should be treated as full text fields.
 *  which fields contain numbers, dates, or geolocations.
 *  the [format][] of date values.
 *  custom rules to control the mapping for [dynamically added fields][].

简而言之，Mapping就是数据的映射关键，决定具体的数据类型及判断是否被分词

下面是具体的创建过程

>   
> PUT test\_index2  
> \{  
>   "settings":\{  
>            "number\_of\_shards":1,   
>            "number\_of\_replicas":0       
>             \},  
>   "mappings": \{  
>       "dynamic": false,  
>       "properties": \{  
>         "title": \{  
>           "type": "text"  
>         \},  
>         "name": \{  
>           "type": "keyword"  
>         \},  
>         "size": \{  
>           "type": "integer"  
>         \},  
>           "price": \{  
>           "type": "integer"  
>         \},  
>         "area": \{  
>           "type": "integer"  
>         \},  
>         "createTime": \{  
>           "type": "date",  
>           "format": "strict\_date\_optional\_time||epoch\_millis"  
>         \},  
>         "lastUpdateTime": \{  
>           "type": "date",  
>           "format": "strict\_date\_optional\_time||epoch\_millis"  
>         \},  
>         "layoutDesc" : \{  
>           "type": "text"
> 
>          \}  
>       \}  
>       
>   \}  
> \}
> 
>

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hfc245OTk5_size_16_color_FFFFFF_t_70][]

生产系统需要注意下面两个配置

"number\_of\_shards":1,   \#\#数据大，就需要多些数据节点，可以把数据均衡分布到不同的节点，可以分布式的查询（并行）  
"number\_of\_replicas":0  \#\#\#设置副本数量，提高数据安全行，同时提升查询性能

\*\*\*\*分片的数量创建后不能改变，副本可以

查看分片信息：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hfc245OTk5_size_16_color_FFFFFF_t_70 1][]

[http://127.0.0.1:9200/test\_index2/\_settings?pretty][http_127.0.0.1_9200_test_index2_settings_pretty]

**kibanna查看：**

**GET test\_index2/\_settings?pretty**  
**GET test\_index2/\_mapping?pretty**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hfc245OTk5_size_16_color_FFFFFF_t_70 2][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hfc245OTk5_size_16_color_FFFFFF_t_70 3][]

[format]: https://www.elastic.co/guide/en/elasticsearch/reference/current/mapping-date-format.html
[dynamically added fields]: https://www.elastic.co/guide/en/elasticsearch/reference/current/dynamic-mapping.html
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hfc245OTk5_size_16_color_FFFFFF_t_70]: /images/20230531/dd456b6a72344c2bad2effec4efcef51.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hfc245OTk5_size_16_color_FFFFFF_t_70 1]: /images/20230531/0c7513d7d3c44446b550029c6678f877.png
[http_127.0.0.1_9200_test_index2_settings_pretty]: http://127.0.0.1:9200/test_index2/_settings?pretty
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hfc245OTk5_size_16_color_FFFFFF_t_70 2]: /images/20230531/c48f9345b0864ac4ace5dec32de64936.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hfc245OTk5_size_16_color_FFFFFF_t_70 3]: /images/20230531/02bad1c347ba4d9f8d93c3e22a0a0dc7.png