zytops 的个人博客

对于elasticsearch查询忽略大小写的问题，官方给出了一个解决方案，使用normalizer来解决，normalizer是keyword的一个属性，可以对keyword生成的单一term,query_string做进一步的处理，比如lowercase,小写转换，使用方式和自定义分词器有相似之处，需要自定义，具体步骤如下。
5 此时由于elasticsearch的索引已经建好，由于es的规则，只能新增字段，不能删除或者修改已经存在的字段，可以动态更新原有索引的setting，动态更新setting，需要先关闭索引，执行玩更新操作以后，再开启索引,步骤如下:

1、在需要操作的索引上操作

//关闭index
POST test/_close
//设置settings
PUT test/_settings
{
  "index": {
    "analysis": {
      "normalizer": {
        "lowercase_normalizer": {
          "type": "custom",
          "char_filter": [],
          "filter": [
            "lowercase"
          ]
        }
      }
    }
  }
}
 //打开index
POST test/_open

2、创建索引并备份需要操作的索引

PUT /xsj_test
POST /_reindex
{
  "source": {
    "index": "test"
  },
  "dest": {
    "index": "xsj_test"
  }
}

3、新建一个新索引，设置normalizer属性，命令如下

PUT 
{
"settings": {
    "number_of_replicas": 1,
    "number_of_shards": 1,
    "analysis": {
      "normalizer": {
        "lowercase_normalizer": {
          "type": "custom",
          "char_filter": [],
          "filter": [
            "lowercase"
          ]
        }
      }
    }
  },
  "mappings": {
    "_doc": {
      "properties": {
        "name_code": {
          "type": "keyword",
          "normalizer": "lowercase_normalizer"
        },
        "canonical_name": {
          "type": "keyword",
          "normalizer": "lowercase_normalizer"
        },
        "col_order": {
          "type": "keyword",
          "normalizer": "lowercase_normalizer"
        },
        "kingdom": {
          "type": "keyword",
          "normalizer": "lowercase_normalizer"
        },
        "sp2000_status_id": {
          "type": "keyword",
          "normalizer": "lowercase_normalizer"
        },
        "phylum": {
          "type": "keyword",
          "normalizer": "lowercase_normalizer"
        },
        "genus": {
          "type": "keyword",
          "normalizer": "lowercase_normalizer"
        },
        "infraspecies": {
          "type": "keyword",
          "normalizer": "lowercase_normalizer"
        },
        "species": {
          "type": "keyword",
          "normalizer": "lowercase_normalizer"
        },
        "authorship": {
          "type": "keyword",
          "normalizer": "lowercase_normalizer"
        },
        "name_status": {
          "type": "keyword",
          "normalizer": "lowercase_normalizer"
        },
        "parent_id": {
          "type": "keyword",
          "normalizer": "lowercase_normalizer"
        },
        "rank": {
          "type": "keyword",
          "normalizer": "lowercase_normalizer"
        },
        "infraspecies_marker": {
          "type": "keyword",
          "normalizer": "lowercase_normalizer"
        },
        "family": {
          "type": "keyword",
          "normalizer": "lowercase_normalizer"
        },
        "class": {
          "type": "keyword",
          "normalizer": "lowercase_normalizer"
        }
      }
    }
  }
}

4、新建完索引以后，还原数据，命令如下

POST /_reindex
{
  "source": {
    "index": "test"
  },
  "dest": {
    "index": "xsj_test"
  }
}

来源：https://blog.csdn.net/juanqiao7497/article/details/112249551