FiltersExtractor.php

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

use Magento\Framework\Search\Request\QueryInterface;
use Magento\Framework\Search\Request\FilterInterface;
use Magento\Framework\Search\Request\Filter\BoolExpression;

class FiltersExtractor
{
    public function extractFiltersFromQuery(QueryInterface $query)
    {
        $filters = [];

        switch ($query->getType()) {
            case QueryInterface::TYPE_BOOL:
                foreach ($query->getMust() as $subQuery) {
                    $filters = array_merge($filters, $this->extractFiltersFromQuery($subQuery));
                }
                foreach ($query->getShould() as $subQuery) {
                    $filters = array_merge($filters, $this->extractFiltersFromQuery($subQuery));
                }
                foreach ($query->getMustNot() as $subQuery) {
                    $filters = array_merge($filters, $this->extractFiltersFromQuery($subQuery));
                }
                break;

            case QueryInterface::TYPE_FILTER:
                $filter = $query->getReference();
                if (FilterInterface::TYPE_BOOL === $filter->getType()) {
                    $filters = array_merge($filters, $this->getFiltersFromBoolFilter($filter));
                } else {
                    $filters[] = $filter;
                }
                break;

            default:
                break;
        }

        return $filters;
    }

    private function getFiltersFromBoolFilter(BoolExpression $boolExpression)
    {
        $filters = [];

        foreach ($boolExpression->getMust() as $filter) {
            if ($filter->getType() === FilterInterface::TYPE_BOOL) {
                $filters = array_merge($filters, $this->getFiltersFromBoolFilter($filter));
            } else {
                $filters[] = $filter;
            }
        }
        foreach ($boolExpression->getShould() as $filter) {
            if ($filter->getType() === FilterInterface::TYPE_BOOL) {
                $filters = array_merge($filters, $this->getFiltersFromBoolFilter($filter));
            } else {
                $filters[] = $filter;
            }
        }
        foreach ($boolExpression->getMustNot() as $filter) {
            if ($filter->getType() === FilterInterface::TYPE_BOOL) {
                $filters = array_merge($filters, $this->getFiltersFromBoolFilter($filter));
            } else {
                $filters[] = $filter;
            }
        }
        return $filters;
    }
}