What all are the possible problems if I don't give keyword mapping to my text type?

Elastic Stack Elasticsearch
3

Thanks @Mark_Harwood

My intention was just to search inside those long text fields. Not the entire text, but keywords inside that. In this case, kindly tell me is it OK to go with the below config;

    "long_text_field_1": {
      "type": "text",
      "fields": {
        "keyword": {
          "type": "keyword",
		  "ignore_above": 256
        }
      }
    },
	"long_text_field_2": {
      "type": "text",
      "fields": {
        "keyword": {
          "type": "keyword",
		  "ignore_above": 256
        }
      }
    },