AggregationResolver.php

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

use Magento\Framework\Search\RequestInterface;

class AggregationResolver implements AggregationResolverInterface
{
    private $resolvers;

    public function __construct(array $resolvers = [])
    {
        $this->resolvers = $resolvers;
    }

    public function resolve(RequestInterface $request, array $documentIds)
    {
        $aggregations = isset($this->resolvers[$request->getIndex()])
            ? $this->resolvers[$request->getIndex()]->resolve($request, $documentIds)
            : $request->getAggregation();
        return $aggregations;
    }
}