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  • ElasticSearch(二十六)修改分词器及定制自己的分词器

    1、默认的分词器

    standard 分词器

    standard tokenizer:以单词边界进行切分
    standard token filter:什么都不做
    lowercase token filter:将所有字母转换为小写
    stop token filer(默认被禁用):移除停用词,比如a the it等等

    2、修改分词器的设置

    启用english停用词token filter

    PUT /my_index
    {
      "settings": {
        "analysis": {
          "analyzer": {
            "es_std": {
              "type": "standard",
              "stopwords": "_english_"
            }
          }
        }
      }
    }
    
    GET /my_index/_analyze
    {
      "analyzer": "standard", 
      "text": "a dog is in the house"
    }
    
    GET /my_index/_analyze
    {
      "analyzer": "es_std",
      "text":"a dog is in the house"
    }

    3、定制化自己的分词器

    1.&字符转换

    2.停用某些词

    3.大小写转换

    PUT /my_index
    {
      "settings": {
        "analysis": {
          "char_filter": {
            "&_to_and": {
              "type": "mapping",
              "mappings": ["&=> and"]
            }
          },
          "filter": {
            "my_stopwords": {
              "type": "stop",
              "stopwords": ["the", "a"]
            }
          },
          "analyzer": {
            "my_analyzer": {
              "type": "custom",
              "char_filter": ["html_strip", "&_to_and"],
              "tokenizer": "standard",
              "filter": ["lowercase", "my_stopwords"]
            }
          }
        }
      }
    }
    
    GET /my_index/_analyze
    {
      "text": "tom&jerry are a friend in the house, <a>, HAHA!!",
      "analyzer": "my_analyzer"
    }
    
    PUT /my_index/_mapping/my_type
    {
      "properties": {
        "content": {
          "type": "text",
          "analyzer": "my_analyzer"
        }
      }
    }
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  • 原文地址:https://www.cnblogs.com/ql211lin/p/10909375.html
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