CollectionFilter.php

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

use Magento\Catalog\Model\Category;
use Magento\Search\Model\QueryFactory;

class CollectionFilter
{
    protected $queryFactory;

    public function __construct(QueryFactory $queryFactory)
    {
        $this->queryFactory = $queryFactory;
    }

    public function afterFilter(
        \Magento\Catalog\Model\Layer\Search\CollectionFilter $subject,
        $result,
        $collection,
        Category $category
    ) {
        $query = $this->queryFactory->get();
        if (!$query->isQueryTextShort()) {
            $collection->addSearchFilter($query->getQueryText());
        }
    }
}