Elasticsearch Search API 介绍

迷南。 2023-07-04 08:41 29阅读 0赞

### 一、URI Search & Request Body Search ###

按传递参数方式分为两类  
**1）URI Search**

*  在URL中使用查询参数。
 *  使用“q”，指定查询字符串。
 *  “query string syntax”，KV健值对。  
    ![在这里插入图片描述][20200209163045595.png]  
    演示：  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2OTE4MTQ5_size_16_color_FFFFFF_t_70]  
    **2）Request Body Search**  
    使用Elasticsearch提供的，基于JSON格式的Query Domain Specific Language (DSL)  
    请求格式说明  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2OTE4MTQ5_size_16_color_FFFFFF_t_70 1]  
    返回报文格式说明  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2OTE4MTQ5_size_16_color_FFFFFF_t_70 2]  
    示例  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2OTE4MTQ5_size_16_color_FFFFFF_t_70 3]  
    备注：查询结果只有hits中的值，只有前10条结果记录

**3) 指定查询的索引（需要在URL中指定）**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2OTE4MTQ5_size_16_color_FFFFFF_t_70 4]

### 二、什么是搜索的相关性Relevance ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2OTE4MTQ5_size_16_color_FFFFFF_t_70 5]

### 三、如何平衡相关性 ###

**1）衡量3指标**  
![在这里插入图片描述][20200209165226477.png]  
**2）如何改善搜索结果集**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2OTE4MTQ5_size_16_color_FFFFFF_t_70 6]

[20200209163045595.png]: https://img-blog.csdnimg.cn/20200209163045595.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2OTE4MTQ5_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20200209164037611.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2OTE4MTQ5,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2OTE4MTQ5_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/2020020916413987.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2OTE4MTQ5,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2OTE4MTQ5_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/2020020916423098.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2OTE4MTQ5,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2OTE4MTQ5_size_16_color_FFFFFF_t_70 3]: https://img-blog.csdnimg.cn/20200209164857450.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2OTE4MTQ5,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2OTE4MTQ5_size_16_color_FFFFFF_t_70 4]: https://img-blog.csdnimg.cn/20200209162801170.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2OTE4MTQ5,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2OTE4MTQ5_size_16_color_FFFFFF_t_70 5]: https://img-blog.csdnimg.cn/20200209165106625.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2OTE4MTQ5,size_16,color_FFFFFF,t_70
[20200209165226477.png]: https://img-blog.csdnimg.cn/20200209165226477.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2OTE4MTQ5_size_16_color_FFFFFF_t_70 6]: https://img-blog.csdnimg.cn/20200209165526523.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2OTE4MTQ5,size_16,color_FFFFFF,t_70