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一、题目

### 基础版

Create a search template for the above query, so that the template

(i) is named "with_response_and_tag",

(ii) has a parameter "with_min_response" to represent the lower bound of the `response` field,

(iii) has a parameter "with_max_response" to represent the upper bound of the `response` field,

(iv) has a parameter "with_tag" to represent a possible value of the `tags` field

Test the "with_response_and_tag" search template by setting the

parameters as follows:

(i) "with_min_response": 400,

(ii) "with_max_response": 500

(iii) "with_tag": "security"

### 进阶版

Update the "with_response_and_tag" search template, so that

(i) if the "with_max_response" parameter is not set, then don't set an upper bound to the `response` value, and

(ii) if the "with_tag" parameter is not set, then do not apply that filter at all

Test the "with_response_and_tag" search template by setting only the "with_min_response" parameter to 500

Test the "with_response_and_tag" search template by setting the parameters as follows:

(i) "with_min_response": 500,

(ii) "with_tag": "security"

二、思考

此题主要考察的是查询模版，这在日常工作中用到的比较少，需要注意写法和格式。如下是官方API提供一个模版样例，可以参照这个进行改造查询模版。此外创建模版后要注意验证模版，因为创建模版成功并不代表可以正常执行。

PUT _scripts/my-search-template
{"script": {"lang": "mustache","source": {"query": {"match": {"message": "{{query_string}}"}},"from": "{{from}}","size": "{{size}}"}}
}

三、解题

Step 1、【基础版】创建模版

PUT _scripts/with_response_and_tag
{"script": {"lang": "mustache","source": {"query": {"range": {"response": {"gte": "{{with_max_response}}","lte": "{{with_min_response}}"}},"match": {"tags": "{{with_tag}}"}}}}
}

Step 2、【基础版】验证模版

POST _render/template
{"id": "with_response_and_tag","params": {"with_max_response": "500","with_min_response": "400","with_tag":"security"}
}

Step 3、【基础版】执行模版查询

GET my-index/_search/template
{"id": "with_response_and_tag","params": {"with_max_response": "500","with_min_response": "400","with_tag":"security"}
}

Step 4、【进阶版】更新模版

这里有几点需要注意

• source里可以使用三引号包裹，这样就可以不使用转移符
• 如果参数中有使用条件，则使用 {{#condition}}content{{/condition}}，外面不要引号
• 如果是if else判断条件，则使用 {{#condition}}if content{{/condition}} {{^condition}}else content{{/condition}}，外面不带引号
• 默认值方式，{{my-var}}{{^my-var}}default value{{/my-var}}，外面需要引号

PUT _scripts/with_response_and_tag
{"script": {"lang": "mustache","source": """{"query": {"bool": {"filter": [{"range": {"response": {"gte": "{{with_min_response}}"{{#with_max_response}},"lte": "{{with_max_response}}"{{/with_max_response}}}}}, {{{#with_tag}}"match": {"tags":"{{with_tag}}"}  {{/with_tag}}}]}}}"""}
}

四、总结

• 查询模版，这在日常工作中用到的比较少，需要注意写法和格式，多联系
• 参数外层需要通过双引号包裹，"{{param}}"
• 不用包裹双引号的有：

  • {{#toJson}}tags{{/toJson}}

  • {{#condition}}content{{/condition}}

  • {#condition}}if content{{/condition}} {{^condition}}else content{{/condition}}

参考资料

• Search templates | Elasticsearch Guide [8.1] | Elastic

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