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Elasticsearch.Net and NEST: the .NET clients [1.x] » Aggregations » Reverse Nested aggregation
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Reverse Nested aggregationedit

A special single bucket aggregation that enables aggregating on parent docs from nested documents.

Fluent DSLedit

var response = client.Search<ElasticSearchProject>(s => s
    .Aggregations(a => a
        .Nested("tags", n => n
            .Path(p => p.Tags)
            .Aggregations(aa => aa
                .Terms("tag_names", t => t
                    .Field(p => p.Tags.Suffix("name"))
                    .Aggregations(aaa => aaa
                        .ReverseNested("tags_to_project", r => r
                            .Path("project")
                            .Aggregations(aaaa => aaaa
                                .Terms("top_projects_per_tag", tt => tt
                                    .Field(p => p.Name)
                                )
                            )
                        )
                    )
                )
            )
        )
    )
);

Object Initializer Syntaxedit

var request = new SearchRequest
{
    Aggregations = new Dictionary<string, IAggregationContainer>
    {
        { "tags", new AggregationContainer
            {
                Nested = new NestedAggregator
                {
                    Path = "tags"
                },
                Aggregations = new Dictionary<string, Nest.IAggregationContainer>
                {
                    {
                        "tag_names", new AggregationContainer
                        {
                            Terms = new TermsAggregator
                            {
                                Field = "tags.name"
                            },
                            Aggregations = new Dictionary<string, Nest.IAggregationContainer>
                            {
                                {
                                    "tags_to_projects", new AggregationContainer
                                    {
                                        ReverseNested = new ReverseNestedAggregator
                                        {
                                            Path = "project"
                                        },
                                        Aggregations = new Dictionary<string, Nest.IAggregationContainer>
                                        {
                                            {
                                                "top_projects_per_tag", new AggregationContainer
                                                {
                                                    Terms = new TermsAggregator
                                                    {
                                                        Field = "name"
                                                    }
                                                }
                                            }
                                        }
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
    }
};

Refer to the original docs fore more information.

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