When type is text, setting "index" to "not_analyzed" does not seem to work

Elastic Stack Elasticsearch
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"properties": {
  "columns": {
    "properties": {
      "id": {
        "type": "keyword",
        "index": "not_analyzed"
      },
      "name": {
        "type": "keyword",
        "index": "not_analyzed"
      },
      "siteId": {
        "type": "keyword",
        "index": "not_analyzed"
      }
    }
  },
  "text": {
    "type": "text",
    "store": "false",
    "analyzer": "hanlp",
    "fields": {
      "keyword": {
        "type": "text",
        "index": "not_analyzed",
        "fielddata": "true"
      }
    }
  }
}

In order to achieve fuzzy queries, I use the following ways to query:

GET/book_page/book_page/_search
{
      "from": 0,
      "size": 10,
      "query": {
        "bool": {
          "must": [
            {
              "script": {
                "script": {
                  "inline": "doc['text_nlp_sore.keyword'].value!=null&&doc['text_nlp_sore.keyword'].value.indexOf(params.a)!=-1",
                  "lang": "painless",
                  "params": {
                    "a": "中文"
                  }
                }
              }
            }
          ]
        }
      },
      "sort": [
        {
          "_script": {
            "script": {
              "inline": "String myText=doc['text_nlp_sore.keyword'].value;if(myText!=null){int count=0;int index=-1;while((index=myText.indexOf(params.a))!=-1){count++;myText=myText.substring(index+params.a.length())}return Math.log(count);}else{return 0;}",
              "lang": "painless",
              "params": {
                "a": "中文"
              }
            },
            "type": "string",
            "order": "desc"
          }
        },
        {
          "bookDate_date_sore": {
            "order": "desc"
          }
        }
      ],
      "highlight": {
        "fields": {
          
        }
      }
    }

But what search does not come out, I doubt that the doc['text_nlp_sore.keyword'].value value is participle? But I clearly set up "index": "not_analyzed". So I want to know if I have made any mistake in that part, or did my doc get the wrong way, please tell me. Thank you

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