Elasticsearch / NEST 6 - storing enums as string - elasticsearch

Question

Is it possible to store enums as string in NEST6?
I've tried this but it does not seem to work. Any suggestions?
var pool = new SingleNodeConnectionPool(new Uri(context.ConnectionString));
connectionSettings = new ConnectionSettings(pool, connection, SourceSerializer());
private static ConnectionSettings.SourceSerializerFactory SourceSerializer()
{
return (builtin, settings) => new JsonNetSerializer(builtin, settings,
() => new JsonSerializerSettings
{
Converters = new List<JsonConverter>
{
new StringEnumConverter()
}
});
}

Answer 1

Use the StringEnumAttribute attribute on the property. This signals to the internal serializer to serialize the enum as a string. In using this, you don't need to use the NEST.JsonNetSerializer package
If you'd like to set it for all enums, you can do so with
private static void Main()
{
var pool = new SingleNodeConnectionPool(new Uri("http://localhost:9200"));
var connectionSettings = new ConnectionSettings(
pool,
(builtin, settings) => new JsonNetSerializer(builtin, settings,
contractJsonConverters: new JsonConverter[] { new StringEnumConverter() }));
var client = new ElasticClient(connectionSettings);
client.Index(new Product { Foo = Foo.Bar }, i => i.Index("examples"));
}
public class Product
{
public Foo Foo { get;set; }
}
public enum Foo
{
Bar
}
which yields a request like
POST http://localhost:9200/examples/product
{
"foo": "Bar"
}
I think the way that you're attempting to set converters should also work and is a bug that it doesn't. I'll open an issue to address.