Builder.php

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<?php
namespace Magento\Elasticsearch\Elasticsearch5\SearchAdapter\Query;

use Magento\Framework\Search\RequestInterface;
use Magento\Elasticsearch\Model\Config;
use Magento\Elasticsearch\SearchAdapter\SearchIndexNameResolver;
use Magento\Elasticsearch\SearchAdapter\Query\Builder\Aggregation as AggregationBuilder;
use Magento\Framework\App\ScopeResolverInterface;

class Builder
{
    protected $clientConfig;

    protected $searchIndexNameResolver;

    protected $aggregationBuilder;

    protected $scopeResolver;

    public function __construct(
        Config $clientConfig,
        SearchIndexNameResolver $searchIndexNameResolver,
        AggregationBuilder $aggregationBuilder,
        ScopeResolverInterface $scopeResolver
    ) {
        $this->clientConfig = $clientConfig;
        $this->searchIndexNameResolver = $searchIndexNameResolver;
        $this->aggregationBuilder = $aggregationBuilder;
        $this->scopeResolver = $scopeResolver;
    }

    public function initQuery(RequestInterface $request)
    {
        $dimension = current($request->getDimensions());
        $storeId = $this->scopeResolver->getScope($dimension->getValue())->getId();
        $searchQuery = [
            'index' => $this->searchIndexNameResolver->getIndexName($storeId, $request->getIndex()),
            'type' => $this->clientConfig->getEntityType(),
            'body' => [
                'from' => $request->getFrom(),
                'size' => $request->getSize(),
                'stored_fields' => ['_id', '_score'],
                'query' => [],
            ],
        ];
        return $searchQuery;
    }

    public function initAggregations(
        RequestInterface $request,
        array $searchQuery
    ) {
        return $this->aggregationBuilder->build($request, $searchQuery);
    }
}