Elasticsearch NEST client served with attribute "not_analyzed" is still parsed when search keywords contain a hyphen

I have a class named "IndexModel":

public class IndexModel
{
    [ElasticProperty(Index= FieldIndexOption.NotAnalyzed, Store = true)]
    public string ModelNumber{ get; set; }
}

      

        
        
        
      

    

The following is how to set up an elastic client:

var uri = new Uri("http://localhost:9200");
var config = new ConnectionSettings(uri);
var client = new ElasticClient(config);
client.Map<IndexModel>(m => m.MapFromAttributes());

      

        
        
        
      

    

I see the resulting output from the answer:

Request {
"indexmodel": {
"properties": {

  "modelNumber": {
    "type": "string",
    "store": true,
    "index": "not_analyzed"
     },
    }
  }
}

      

        
        
        
      

    

and I have one index record for this type, the value of the "ModelNumber" property is "test-123" and the following is my query:

var result = client.Search<IndexModel>(s => s.Query(new TermQuery() { Field = Property.Path<IndexModel>(it => it.ModelNumber), Value = "test-123"}));

      

        
        
        
      

    

here is the final request I got:

Method: POST, 
Url: http://localhost:9200/_search, 
Request: {
  "query": {
    "term": {
      "modelNumber": {
        "value": "test-123"
      }
    }
  }
}

      

        
        
        
      

    

But I can't get the result, if I change the value of the "ModelNumber" property to "test123", reindex it and do a keyword search "test123" then it works, so I think the parser still parsed the ModelNumber property, can anyone help me, thanks.