TermDropdownStrategy.php

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<?php
namespace Magento\CatalogSearch\Model\Search\FilterMapper;

use Magento\CatalogSearch\Model\Adapter\Mysql\Filter\AliasResolver;
use Magento\CatalogSearch\Model\Search\FilterMapper\TermDropdownStrategy\SelectBuilder;
use Magento\Eav\Model\Config as EavConfig;
use Magento\Framework\App\ObjectManager;

class TermDropdownStrategy implements FilterStrategyInterface
{
    private $aliasResolver;

    private $eavConfig;

    private $selectBuilder;

    public function __construct(
        $storeManager,
        $resourceConnection,
        EavConfig $eavConfig,
        $scopeConfig,
        AliasResolver $aliasResolver,
        SelectBuilder $selectBuilder = null
    ) {
        $this->eavConfig = $eavConfig;
        $this->aliasResolver = $aliasResolver;
        $this->selectBuilder = $selectBuilder ?: ObjectManager::getInstance()->get(SelectBuilder::class);
    }

    public function apply(
        \Magento\Framework\Search\Request\FilterInterface $filter,
        \Magento\Framework\DB\Select $select
    ) {
        $alias = $this->aliasResolver->getAlias($filter);
        $attribute = $this->getAttributeByCode($filter->getField());
        $this->selectBuilder->execute((int)$attribute->getId(), $alias, $select);

        return true;
    }

    private function getAttributeByCode($field)
    {
        return $this->eavConfig->getAttribute(\Magento\Catalog\Model\Product::ENTITY, $field);
    }
}