NEST - How can i do multiple nested aggregation? - elasticsearch

Question

How can I do multiple nested aggregation?
I have tried something like this:
Aggregations(x => x
.Nested("Facets", y => y.Path("categories")
.Aggregations(r => r.Terms("categories", w => w.Field(q => q.Categories.FirstOrDefault().Id))
)).Nested("Facets2", s => s.Path("brand")
.Aggregations(e => e.Terms("brand", w => w.Field(q => q.Brand.Id))
)));
But it returns Facets2 as a child of Facets
Can anyone help?

Answer 1

The aggregations that you have work as expected with NEST client version 1.7.1 as demonstrated with this example
void Main()
{
var settings = new ConnectionSettings();
var connection = new InMemoryConnection(settings);
var client = new ElasticClient(connection : connection);
var response = client.Search<Example>(s => s
.Aggregations(aggs => aggs
.Nested("Facets", nested => nested
.Path(p => p.Categories)
.Aggregations(r => r
.Terms("categories", w => w
.Field(q => q.Categories.FirstOrDefault().Id)
)
)
)
.Nested("Facets2", nested => nested
.Path(p => p.Brand)
.Aggregations(e => e
.Terms("brand", w => w
.Field(q => q.Brand.Id)
)
)
)
)
);
Console.WriteLine(Encoding.UTF8.GetString(response.RequestInformation.Request));
}
public class Example
{
public IList<Category> Categories { get; set; }
public Brand Brand { get; set; }
}
public class Brand
{
public int Id { get; set; }
}
public class Category
{
public int Id { get; set; }
}
This outputs the following request query
{
"aggs": {
"Facets": {
"nested": {
"path": "categories"
},
"aggs": {
"categories": {
"terms": {
"field": "categories.id"
}
}
}
},
"Facets2": {
"nested": {
"path": "brand"
},
"aggs": {
"brand": {
"terms": {
"field": "brand.id"
}
}
}
}
}
}