Using must_not and wildcard to search

Elastic Stack Elasticsearch
3

Its text. I did a GET _mapping/field/message and it shows this. Doesn't not say whether its analysed or not. Is default analysed?

  "logstash-2018.05.31": {
    "mappings": {
      "fluentd": {
        "message": {
          "full_name": "message",
          "mapping": {
            "message": {
              "type": "text",
              "fields": {
                "keyword": {
                  "type": "keyword",
                  "ignore_above": 256
                }
              }
            }
          }
        }
      }
    }
  },