An idea to use strongly typed `Suffix` method in elasticsearch NEST library.

FieldInfer.cs

Field postField = elasticClient.Infer.Field<Blog>(p => p.Post); //Field.Name: "post"
Field tagsField = postField.Suffix<Post>(p => p.Tags); //Field.Name: "post.tags"
Field tagsIdField = tagsField.Suffix<Tag>(p => p.Id); //Field.Name: "post.tags.id"

public class FieldInfer : Field
{
    public Inferrer Infer { get; set; }
    public FieldInfer(Inferrer inferrer, string name) : base(name)
    {
        Infer = inferrer;
    }
}

public static class FieldExtensions 
{
    public static FieldInfer Field<T>(this Inferrer inferrer, Expression<Func<T, object>> expression) where T : class
    {
        var field = Infer.Field(expression);
        var name = inferrer.Field(field);
        return new(inferrer, name);
    }

    public static FieldInfer Suffix<T>(this FieldInfer fieldInfer, Expression<Func<T, object>> expression) where T : class
    {
        var field = Infer.Field(expression);
        var name = fieldInfer.Infer.Field(field);
        var suffix = fieldInfer.Name + "." + name;
        return new(fieldInfer.Infer, suffix);
    }
}