public void Nested_Avg()
{
var q = new Query <Customer>(true).NestedAggregation(customer => customer.Products,
AggregationsHelper.AvgAggregation <Customer>(
customer => customer.Products.PropertyName(p => p.Price)))
.SetSize(0);
var result = new DocumentSearch <Customer>().Search(_client, q);
Assert.AreEqual(1000, result.Hits.Total);
var nested = result.NestedAggregation(customer => customer.Products);
Assert.IsNotNull(nested.Nested.Value);
}