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

A single-value metrics aggregation that computes the average of numeric values that are extracted from the aggregated documents.

Fluent DSLedit

var result = client.Search<ElasticsearchProject>(s => s
    .Aggregations(a => a
        .Average("my_avg_agg", avg => avg
            .Field(p => p.Followers.First().Age)
        )
    )
);

var agg = result.Aggs.Avg("my_avg_agg");

Object Initializer Syntaxedit

var request = new SearchRequest
{
    Aggregations = new Dictionary<string, IAggregationContainer>
    {
        { "my_avg_agg", new AggregationContainer
             {
                 Terms = new TermsAggregator
                 {
                     Field = "followers.age"
                 }
             }
        }
    }
};

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

var agg = result.Aggs.Avg("my_avg_agg");

Refer to the original docs for more information.

«  Handling Aggregations     Cardinality aggregation  »