Mc_1 (12)
   Sc_1 (6)
   Sc_12(6)
Mc_2 (4)
  Sc_2 (1)
  Sc_21(3)

[ElasticsearchType(Name = "r")]
public class R
{
    public int Id { get; set; }
    public string Name { get; set; }
    public IList<C> C { get; set; }

    public R()
    {
        C = new List<C>();
    }
}

[ElasticsearchType(Name = "c")]
public class C {
    [Nested]
    public MC Mc { get; set; }
    [Nested]
    public SC Sc { get; set; }

}

[ElasticsearchType(Name = "mc")]
public class MC
{
    public int Id { get; set; }
    public string Name { get; set; }
}
[ElasticsearchType(Name = "sc")]
public class SC
{
    public int Id { get; set; }
    public string Name { get; set; }
}