定义

• 语主相近或相同
• 品牌类目关联
• 搜索它等于搜索它

  配置方法

  1. 进入ES第一个节点：cd node1/config/analysis-ik

  添加近义词
  echo '凯悦,锡伯,红桃' > vim synonyms.txt

  2. 将配置得制到节点2与节点3

  cp synonyms.txt /opt/elasticsearch8.0.0/node2/config/analysis-ik/
  cp synonyms.txt /opt/elasticsearch8.0.0/node3/config/analysis-ik/

  3. 修改结构（定义支持同义词的门店索引结构）

  要点：

  增加analysis，处定义分词器

  修改name的分词器

  DELETE /shop
  PUT /shop
  {
    "settings": {
      "number_of_shards": 1, 
      "number_of_replicas": 1,
      "analysis": {
        "filter": {
            "my_synonym_filter": {
                "type": "synonym",
                "synonyms_path": "analysis-ik/synonyms.txt"
            }
        },
        "analyzer": {
          "ik_syno":{
            "type":"custom",
            "tokenizer":"ik_smart",
            "filter":["my_synonym_filter"]
          },
          "ik_syno_max":{
            "type":"custom",
            "tokenizer":"ik_max_word",
            "filter":["my_synonym_filter"]
          }
        }
      }
    },
    "mappings": {
      "properties": {
        "id":{"type":"integer"},
        "name":{"type":"text","analyzer": "ik_syno_word","search_analyzer": "ik_syno"},
        "tags":{"type":"text","analyzer": "whitespace","fielddata": true}, 
        "location":{"type":"geo_point"},
        "remark_score":{"type":"double"},
        "price_per_man": {"type":"integer"},
        "category_id":{"type":"integer"},
        "category_name":{"type": "keyword"},
        "seller_id":{"type":"integer"},
        "seller_remark_score":{"type":"double"},
        "seller_disabled_flag":{"type":"integer"}
      }
    }
  }

  4. 验证同义词是否载入

  GET /shop/_analyze
  {
    "field":"name",
    "text":"凯悦"
  }

  如输出信息如下，则代表配置成功

  {
    "tokens" : [
      {
        "token" : "凯悦",
        "start_offset" : 0,
        "end_offset" : 2,
        "type" : "CN_WORD",
        "position" : 0
      },
      {
        "token" : "锡伯",
        "start_offset" : 0,
        "end_offset" : 2,
        "type" : "SYNONYM",
        "position" : 0
      },
      {
        "token" : "红桃",
        "start_offset" : 0,
        "end_offset" : 2,
        "type" : "SYNONYM",
        "position" : 0
      }
    ]
  }

  5. 其他

  1). 重建索引

  如果结构之前就存在，要让同义词起作用，需要先删除原索引再重建结构（如上）

  如果是新索引，则不需要行该步骤 .

  2). 在Kibana上验证

  以下会查询相同的内容

  GET /shop/_search
  {
    "query": {
      "match": {
        "name": "锡伯"
      }
    }
  }
  GET /shop/_search
  {
    "query": {
      "match": {
        "name": "凯悦"
      }
    }
  }
  GET /shop/_search
  {
    "query": {
      "match": {
        "name": "红桃"
      }
    }
  }

   
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