白话Elasticsearch56-数据建模之 Path Hierarchy Tokenizer 对文件系统进行数据建模以及文件搜索

2021-08-17 15:04:48 浏览数 (1)

概述

继续跟中华石杉老师学习ES，第56篇

课程地址： https://www.roncoo.com/view/55

官网

简言之，就是对类似文件系统这种的有多层级关系的数据进行分词

Path Hierarchy Tokenizer：戳这里

Path Hierarchy Tokenizer Examples：戳这里

示例

模拟：文件系统数据构造

代码语言：javascript复制
PUT /filesystem
{
  "settings": {
    "analysis": {
      "analyzer": {
        "paths": { 
          "tokenizer": "path_hierarchy"
        }
      }
    }
  }
}

测试path_hierarchy分词

代码语言：javascript复制
POST filesystem/_analyze
{
  "tokenizer": "path_hierarchy",
  "text": "/home/elasticsearch/image"
}

返回：

代码语言：javascript复制
{
  "tokens": [
    {
      "token": "/home",
      "start_offset": 0,
      "end_offset": 5,
      "type": "word",
      "position": 0
    },
    {
      "token": "/home/elasticsearch",
      "start_offset": 0,
      "end_offset": 19,
      "type": "word",
      "position": 0
    },
    {
      "token": "/home/elasticsearch/image",
      "start_offset": 0,
      "end_offset": 25,
      "type": "word",
      "position": 0
    }
  ]
}

path_hierarchy tokenizer: 会把/a/b/c/d路径通过path_hierarchy 分词为 /a/b/c/d, /a/b/c, /a/b, /a

需求一： 查找一份，内容包括ES，在/workspace/workspace/projects/helloworld这个目录下的文件

手动指定字段类型，并模拟个数据到索引

代码语言：javascript复制
#指定字段类型
PUT /filesystem/_mapping/file
{
  "properties": {
    "name": { 
      "type":  "keyword"
    },
    "path": { 
      "type":  "keyword",
      "fields": {
        "tree": { 
          "type":     "text",
          "analyzer": "paths"
        }
      }
    }
  }
}

#查看映射
GET /filesystem/_mapping

#写入数据
PUT /filesystem/file/1
{
  "name":     "README.txt", 
  "path":     "/workspace/projects/helloworld", 
  "contents": "小工匠跟石杉老师学习ES"
}

需求DSL:

代码语言：javascript复制
#文件搜索需求：查找一份，内容包括ES，在/workspace/workspace/projects/helloworld这个目录下的文件


GET /filesystem/_search
{
  "query": {
    "bool": {
      "must": [
        {
          "match": {
            "contents": "ES"
          }
        }
      ],
      "filter": {
        "term": {
          "path": "/workspace/projects/helloworld"
        }
      }
    }
  }
}

返回：

需求二： 搜索/workspace目录下，内容包含ES的所有的文件

再写几条数据进去

代码语言：javascript复制
PUT /filesystem/file/2
{
  "name":     "README.txt", 
  "path":     "/workspace/projects", 
  "contents": "小工匠跟石杉老师学习ES"
}


PUT /filesystem/file/3
{
  "name":     "README.txt", 
  "path":     "/workspace/xxxxx", 
  "contents": "小工匠跟石杉老师学习ES"
}


PUT /filesystem/file/4
{
  "name":     "README.txt", 
  "path":     "/home/artisan", 
  "contents": "小工匠跟石杉老师学习ES"
}


PUT /filesystem/file/5
{
  "name":     "README.txt", 
  "path":     "/workspace", 
  "contents": "小工匠跟石杉老师学习ES"
}

需求DSL： "path.tree": "/workspace"

代码语言：javascript复制
GET filesystem/_search
{
  "query": {
    "bool": {
      "must": [
        {
          "match": {
             "contents": "ES"
          }
        }
      ],
      "filter": {
        "term": {
          "path.tree": "/workspace"
        }
      }
    }
  }
}

返回：

代码语言：javascript复制
{
  "took": 8,
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": 4,
    "max_score": 0.2876821,
    "hits": [
      {
        "_index": "filesystem",
        "_type": "file",
        "_id": "5",
        "_score": 0.2876821,
        "_source": {
          "name": "README.txt",
          "path": "/workspace",
          "contents": "小工匠跟石杉老师学习ES"
        }
      },
      {
        "_index": "filesystem",
        "_type": "file",
        "_id": "1",
        "_score": 0.2876821,
        "_source": {
          "name": "README.txt",
          "path": "/workspace/projects/helloworld",
          "contents": "小工匠跟石杉老师学习ES"
        }
      },
      {
        "_index": "filesystem",
        "_type": "file",
        "_id": "3",
        "_score": 0.2876821,
        "_source": {
          "name": "README.txt",
          "path": "/workspace/xxxxx",
          "contents": "小工匠跟石杉老师学习ES"
        }
      },
      {
        "_index": "filesystem",
        "_type": "file",
        "_id": "2",
        "_score": 0.18232156,
        "_source": {
          "name": "README.txt",
          "path": "/workspace/projects",
          "contents": "小工匠跟石杉老师学习ES"
        }
      }
    ]
  }
}

可以看到id=4的数据，不符合需求，没有被查询出来，OK。

es

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