elasticsearch 忽略大小写模糊搜索实现

{
    "settings": {
        "analysis": {
            "analyzer": {
                "caseSensitive": {
                    "filter": "lowercase",
                    "type": "custom",
                    "tokenizer": "keyword"
                }
            }
        }
    },
    "mappings": {
        "personInfo": {
            "properties": {
                "userName": {
                    "type": "string",
                    "analyzer": "caseSensitive",
                    "search_analyzer": "caseSensitive"
                }
            }
        }
    }
}

{
  "query":{
        "wildcard" : {
            "userName": "*zhangsan*"
        }
  }
}