CustomAttributeFilterCheck.php

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

use Magento\Framework\Search\Request\FilterInterface;
use Magento\Eav\Model\Config as EavConfig;
use Magento\Catalog\Model\Product;

class CustomAttributeFilterCheck
{
    private $eavConfig;

    public function __construct(
        EavConfig $eavConfig
    ) {
        $this->eavConfig = $eavConfig;
    }

    public function isCustom(FilterInterface $filter)
    {
        $attribute = $this->getAttributeByCode($filter->getField());

        return $attribute
            && $filter->getType() === FilterInterface::TYPE_TERM
            && in_array($attribute->getFrontendInput(), ['select', 'multiselect'], true);
    }

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