ElasticsearchDateHistogramAggregation example

$composite = new CompositeAggregation($aggregation->getName());

        if ($fieldSorting = $aggregation->getSorting()) {
            $accessor = $this->buildAccessor($definition, $fieldSorting->getField(), $context);

            $sorting = new Bucketing\TermsAggregation($aggregation->getName() . '.sorting', $accessor);
            $sorting->addParameter('order', $fieldSorting->getDirection());

            $composite->addSource($sorting);
        }

        $histogram = new ElasticsearchDateHistogramAggregation(
            $aggregation->getName() . '.key',
            $fieldName,
            $aggregation->getInterval(),
            'yyyy-MM-dd HH:mm:ss'
        );

        if ($aggregation->getTimeZone()) {
            $histogram->addParameter('time_zone', $aggregation->getTimeZone());
        }

        $composite->addSource($histogram);