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

A single-value metrics aggregation that calculates an approximate count of distinct values.

Fluent DSLedit

var result = client.Search<ElasticsearchProject>(s => s
    .Aggregations(a => a
        .Cardinality("my_cardinality_agg", c => c
            .Field(p => p.Followers.First().FirstName)
        )
    )
);

var agg = result.Aggs.Cardinality("my_cardinality_agg");

Object Initializer Syntaxedit

    var request = new SearchRequest
    {
        Aggregations = new Dictionary<string, IAggregationContainer>
        {
            { "my_cardinality_agg", new AggregationContainer
                 {
                     Cardinality = new CardinalityAggregator
                     {
                         Field = "followers.firstName"
                     }
                 }
            }
        }
    };

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

    var agg = result.Aggs.Cardinality("my_cardinality_agg");

Refer to the original docs for more information.

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