Elasticsearch nest 2.x - 搜索返回null值

Question

我对elasticsearch nest 2.x客户端存在问题

我有一个这样的模型：

   public class ProductPrice 
{

    public string ProductImagePath { get; set; }
    public string VideoPath { get; set; }
    public bool ProfitRateIsSet { get; set; }
    public decimal? ProfitRate { get; set; }
    public decimal TLPrice { get; set; }
    public string SearchKey { get; set; }

}

我写了这段代码，

        var node = new Uri("http://localhost:9200");

        var settings = new ConnectionSettings(node);
        settings.PrettyJson(true);


        var client = new ElasticClient(settings);


 var createIndexDescriptor = new CreateIndexDescriptor("product-price")
        .Mappings(ms => ms
                        .Map<ProductPrice>(m => m.AutoMap())
                 );
        var response = client.CreateIndex(createIndexDescriptor);


   var request2 = client.Search<ProductPrice>(s => s
                .Index(ElasticConnect.Constants.Index.PRODUCT_PRICE)
                .Type(ElasticConnect.Constants.Type.COUCHBASE_DOCUMENT)
                .From(0)
                .Size(10)
                .Query(q => q
                        .Term("productID", "210068468")
                )
        );

搜索是成功查找产品，但productprice模型属性始终为null。

我在哪里做错了？