Elasticsearch Index Template

拼搏现实的明天。 2023-07-07 11:19 13阅读 0赞

### 1）环境准备 ###

启动Elasticsearch https://blog.csdn.net/qq\_36918149/article/details/104221934  
启动Kinbana https://blog.csdn.net/qq\_36918149/article/details/104224625

### 2) 什么是Index Template？ ###

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

### 3) Index Template 有哪些应用场景？ ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2OTE4MTQ5_size_16_color_FFFFFF_t_70 1]

### 4）Index Template 的工作方式 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2OTE4MTQ5_size_16_color_FFFFFF_t_70 2]

### 5）demo ###

演示一：

#数字字符串被映射成text，日期字符串被映射成日期
    PUT ttemplate/_doc/1
    { 
    	"someNumber":"1",
    	"someDate":"2019/01/01"
    }
    #查看索引情况
    GET ttemplate/_mapping

结果：someDate 被识别为Date，someNumber没有被识别为数字类型  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2OTE4MTQ5_size_16_color_FFFFFF_t_70 3]

#Create a default template ：分片数为1，副本数为1
    PUT _template/template_default 
    { 
      "index_patterns": ["*"],
      "order" : 0,
      "version": 1,
      "settings": { 
        "number_of_shards": 1,
        "number_of_replicas":1
      }
    }
    
    #自定义template：index以test*开头，分片数为1，副本数为2，date类型不自动识别，数字类型自动识别
    PUT /_template/template_test
    { 
        "index_patterns" : ["test*"],
        "order" : 1,
        "settings" : { 
        	"number_of_shards": 1,
            "number_of_replicas" : 2
        },
        "mappings" : { 
        	"date_detection": false,
        	"numeric_detection": true
        }
    }

#查看template信息
    GET /_template/temp*

结果：template\_test、template\_default 两个template 都成功创建，但order 数字不一样  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2OTE4MTQ5_size_16_color_FFFFFF_t_70 4]

#写入新的数据，index以test开头
    PUT testtemplate/_doc/1
    { 
    	"someNumber":"1",
    	"someDate":"2019/01/01"
    }

\#查看mapping、setting

GET testtemplate/_mapping
    get testtemplate/_settings

结果：分片数为1，副本数为2，date类型不自动识别，数字类型自动识别，最终 index为 template\_test生效  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2OTE4MTQ5_size_16_color_FFFFFF_t_70 5]  
演示二：创建index 中设置的setting 优先级最高，次演示依赖演示一数据

#设置 副本数量为5
    PUT testmy
    { 
    	"settings":{ 
    		"number_of_replicas":5
    	}
    }
    
    put testmy/_doc/1
    { 
      "key":"value"
    }
    
    get testmy/_settings

结果：副本数量为5，说明创建index时候设置的setting优先级最高  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2OTE4MTQ5_size_16_color_FFFFFF_t_70 6]

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