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Nested aggregation

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Nested aggregation

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A special single bucket aggregation that enables aggregating nested documents.

Fluent DSL

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var result = client.Search<ElasticsearchProject>(s => s
    .Aggregations(a => a
        .Nested("my_nested_agg", n => n
            .Path("contributors")
            .Aggregations(aa => aa
                .Average("my_avg_agg", avg => avg
                    .Field(p => p.Contributors.First().Age)
                )
            )
        )
    )
);

var nestedAgg = result.Aggs.Nested("my_nested_agg");
var avgAgg = nestedAgg.Average("my_ avg_agg");

Object Initializer Syntax

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var request = new SearchRequest
{
    Aggregations = new Dictionary<string, IAggregationContainer>
    {
        { "my_nested_agg", new AggregationContainer
            {
                Nested = new NestedAggregator
                {
                    Path = "contributors"
                },
                Aggregations = new Dictionary<string, IAggregationContainer>
                {
                    { "my_avg_agg", new AggregationContainer
                        {
                            Average = new AverageAggregator
                            {
                                Field = "contributors.age"
                            }
                        }
                    }
                }
            }
        }
    }
};

var result = client.Search<ElasticsearchProject>(request);

var nestedAgg = result.Aggs.Nested("my_nested_agg");
var avgAgg = nestedAgg.Average("my_avg_agg");

Refer to the original docs for more information.

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