ElasticSearch query_string parsing quotes on not_analyzed field vs. standard tokenizer

ES_quoted_query_not_analyzed

PUT http://localhost:9200/_template/txt
    {
      "template": "index_dev", 
      "order": 0,
      "mappings": {
        "_default_": { 
          "dynamic_templates": [
            {
              "template_txt": {
                "mapping": {
                  "index": "not_analyzed",
                  "type": "string"
                },
                "match_mapping_type": "string",
                "match": "*_txt"
              }
            }
          ]
        }
      }    
    }  
DELETE http://localhost:9200/index_dev

POST http://localhost:9200/index_dev/1
{
  "content_test_txt": "this is the volume, offered",
  "content_test": "this is the volume, offered"
}
    
GET http://localhost:9200/index_dev/_mapping

GET http://localhost:9200/index_dev/_validate/query?explain
{
  "query": {
    "query_string": {
      "query": "content_test_txt:(\"volume, offered\")"
    }
  }
}

GET http://localhost:9200/index_dev/_validate/query?explain
{
  "query": {
    "query_string": {
      "query": "content_test:(\"volume, offered\")"
    }
  }
}