AggregationFactory.php

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<?php
namespace Magento\Framework\Search\Adapter\Mysql;

class AggregationFactory
{
    protected $objectManager;

    public function __construct(\Magento\Framework\ObjectManagerInterface $objectManager)
    {
        $this->objectManager = $objectManager;
    }

    public function create(array $rawAggregation)
    {
        $buckets = [];
        foreach ($rawAggregation as $rawBucketName => $rawBucket) {
            $buckets[$rawBucketName] = $this->objectManager->create(
                \Magento\Framework\Search\Response\Bucket::class,
                [
                    'name' => $rawBucketName,
                    'values' => $this->prepareValues((array)$rawBucket)
                ]
            );
        }
        return $this->objectManager->create(
            \Magento\Framework\Search\Response\Aggregation::class,
            ['buckets' => $buckets]
        );
    }

    private function prepareValues(array $values)
    {
        $valuesObjects = [];
        foreach ($values as $name => $value) {
            $valuesObjects[] = $this->objectManager->create(
                \Magento\Framework\Search\Response\Aggregation\Value::class,
                [
                    'value' => $name,
                    'metrics' => $value,
                ]
            );
        }
        return $valuesObjects;
    }
}