我已经创建了下面的对象，该对象将被映射到ElasticSearch类型。我想UnivId从索引中排除该属性：

[ElasticType(Name = "Type1")]
public class Type1
{
    // To be ignored
    public string UnivId { get; set; }

    [ElasticProperty(Name="Id")]
    public int Id { get; set; }

    [ElasticProperty(Name = "descSearch")]
    public string descSearch { get; set; }
}