ES 检索 wordpdf 文档插件 ingest attachment 的管道配置和文档结构映射

Posted 2022-05-10 catoop

一、安装 ingest attachment 插件

安装方法：https://blog.csdn.net/catoop/article/details/124468788

二、定义文本抽取管道

1.单附件（示例）

PUT _ingest/pipeline/attachment

    "description": "Extract attachment information",
    "processors": [
        
            "attachment": 
                "field": "data",
                "ignore_missing": true
            
        ,
        
            "remove": 
                "field": "data",
            
        
    ]

其中remove段的配置表示附件经过管道处理后删除附件本身，只将附件的文字存入ES中，附件自身base64的数据抛弃掉。

2.多附件（示例）

PUT _ingest/pipeline/attachment

    "description": "Extract attachment information",
    "processors": [
        
            "foreach": 
                "field": "attachments",
                "processor": 
                    "attachment": 
                        "field": "_ingest._value.data",
                        "target_field": "_ingest._value.attachment"
                    
                
            
        ,
        
            "foreach": 
                "field": "attachments",
                "processor": 
                    "remove": 
                        "field": "_ingest._value.data",
                        "target_field": "_ingest._value.attachment"
                    
                
            
        
    ]

需要注意的是，多附件的情况下，field 和 target_field 必须要写成 _ingest._value.*，否则不能匹配正确的字段。
从 es 8.0 版本开始，需要删除二进制文件内容，只需要为 attachment 添加一个属性 remove_binary 为 true，就不需要像上面那样单独写一个 remove 处理器了。

三、建立文档结构映射

1.单附件（示例）

PUT newdoc_dispatch

  "mappings": 
    "properties": 
      "businessId":
        "type": "keyword"
      ,
      "title":
        "type": "text",
        "analyzer": "ik_smart"
      ,
      "fullDocNO":
        "type": "text",
        "analyzer": "ik_smart"
      ,
      "drafterUser":
        "type": "keyword"
      ,
      "dispatchNO":
        "type": "text",
        "analyzer": "ik_smart"
      ,
      "dispatchDept":
        "type": "keyword"
      ,
      "dispatchTime":
        "type": "date"
      ,
      "abolish":
        "type": "keyword"
      ,
      "tenantId":
        "type": "keyword"
      ,
      "attachment": 
        "properties": 
          "content":
            "type": "text",
            "analyzer": "ik_smart"
          
        
      
    
  

2.多附件（示例）

PUT newdoc_dispatch

  "mappings": 
    "properties": 
      "businessId":
        "type": "keyword"
      ,
      "title":
        "type": "text",
        "analyzer": "ik_smart"
      ,
      "fullDocNO":
        "type": "text",
        "analyzer": "ik_smart"
      ,
      "drafterUser":
        "type": "keyword"
      ,
      "dispatchNO":
        "type": "text",
        "analyzer": "ik_smart"
      ,
      "dispatchDept":
        "type": "keyword"
      ,
      "dispatchTime":
        "type": "date",
        "format": "yyyy-MM-dd HH:mm:ss||yyyy-MM-dd||epoch_millis"
      ,
      "abolish":
        "type": "keyword"
      ,
      "tenantid":
        "type": "keyword"
      ,
      "attachments" : 
        "properties" : 
          "attachment" : 
            "properties" : 
              "content" : 
                "type" : "text",
                "analyzer": "ik_smart"
              
            
                  
        
      
    
  

工程中的代码是多附件的示例，mapping结构映射的对象详见ESDispatchDocumentVo

官网参考资料：https://www.elastic.co/guide/en/elasticsearch/plugins/current/using-ingest-attachment.html
其他参考资料：https://www.cnblogs.com/ncore/p/10475909.html
代码工程参考：https://gitee.com/catoop/es-attachment

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