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# Avg Aggregation > More info about avg aggregation is in the [official elasticsearch docs][1] A single-value metrics aggregation that computes the average of numeric values that are extracted from the aggregated documents. ## Simple example ```JSON { "aggregations": { "avg_grade": { "avg": { "field": "grade" } } } } ``` And now the query via DSL: ```php $avgAggregation = new AvgAggregation('avg_grade'); $avgAggregation->setField('grade'); $search = new Search(); $search->addAggregation($avgAggregation); $queryArray = $search->toArray(); ``` [1]: https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-metrics-avg-aggregation.html
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