Mapping elastic query response to POCOs in NEST

[Daniel_Makos (Dániel Mákos)]

Following up on this question here: How to map C# DateTime property to @timestamp field
I initialize the Elastic connection:

ElasticsearchClientSettings settings;
            using (settings = new ElasticsearchClientSettings(new Uri($"{configOptions.Url}")))
            {
                settings = settings
                    .Authentication(authentication)
                    .DefaultIndex("filebeat-*-app-logs-*");
                Client = new ElasticsearchClient(settings);

                Client.ElasticsearchClientSettings.PropertyMappings
                    .Add(typeof(Audit).GetMember("Timestamp")[0], new PropertyMapping() { Name = "@timestamp" });
            }

My query

            var searchResponse = await _client.Client.SearchAsync<T>(s => s
               .Query(q => q
                    .MatchPhrase(m => m
                        .Field("fields.ThermostatId")
                        .Query("some-guid-here"))));

is able to map data to some of the Properties, namely to the text types Message and Level, all the others stay default initialized.

public class Audit
    {
        [Keyword(Name = "_id")]
        public Guid Id { get; set; }

        [Date(Name = "@timestamp")]
        public DateTime Timestamp { get; set; }

        [Keyword(Name = "level")]
        public string Level { get; set; }

        [Keyword(Name = "Message")]
        public string Message { get; set; }

        [Nested]
        public ThermostatLog Fields { get; set; }

I tried manually mapping in the config but it doesn't make any difference. The annotiation in the entity class is not proven to be enough.