Children Aggregation Usage

A special single bucket aggregation that enables aggregating from buckets on parent document types to buckets on child documents.

Be sure to read the Elasticsearch documentation on Children Aggregation

Fluent DSL example

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a => a
.Children<CommitActivity>("name_of_child_agg", child => child
    .Aggregations(childAggs => childAggs
        .Average("average_per_child", avg => avg.Field(p => p.ConfidenceFactor))
        .Max("max_per_child", avg => avg.Field(p => p.ConfidenceFactor))
        .Min("min_per_child", avg => avg.Field(p => p.ConfidenceFactor))
    )
)

Object Initializer syntax example

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new ChildrenAggregation("name_of_child_agg", typeof(CommitActivity))
{
    Aggregations =
        new AverageAggregation("average_per_child", "confidenceFactor")
        && new MaxAggregation("max_per_child", "confidenceFactor")
        && new MinAggregation("min_per_child", "confidenceFactor")
}

Example json output.

{
  "name_of_child_agg": {
    "children": {
      "type": "commits"
    },
    "aggs": {
      "average_per_child": {
        "avg": {
          "field": "confidenceFactor"
        }
      },
      "max_per_child": {
        "max": {
          "field": "confidenceFactor"
        }
      },
      "min_per_child": {
        "min": {
          "field": "confidenceFactor"
        }
      }
    }
  }
}

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