Config.php

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

use Magento\Backend\Model\Search\Config\Result\Builder;
use Magento\Config\Model\Config\Structure;
use Magento\Config\Model\Config\Structure\Element\AbstractComposite;
use Magento\Config\Model\Config\Structure\Element\Iterator as ElementIterator;

class Config extends \Magento\Framework\DataObject
{
    private $configStructure;

    private $resultBuilder;

    public function __construct(Structure $configStructure, Builder $resultBuilder)
    {
        $this->configStructure = $configStructure;
        $this->resultBuilder = $resultBuilder;
    }

    public function setQuery($query)
    {
        $this->setData('query', $query);
        return $this;
    }

    public function getQuery()
    {
        return $this->getData('query');
    }

    public function hasQuery()
    {
        return $this->hasData('query');
    }

    public function setResults(array $results)
    {
        $this->setData('results', $results);
        return $this;
    }

    public function getResults()
    {
        return $this->getData('results');
    }

    public function load()
    {
        $this->findInStructure($this->configStructure->getTabs(), $this->getQuery());
        $this->setResults($this->resultBuilder->getAll());
        return $this;
    }

    private function findInStructure(ElementIterator $structureElementIterator, $searchTerm, $pathLabel = '')
    {
        if (empty($searchTerm)) {
            return;
        }
        foreach ($structureElementIterator as $structureElement) {
            if (mb_stripos((string)$structureElement->getLabel(), $searchTerm) !== false) {
                $this->resultBuilder->add($structureElement, $pathLabel);
            }
            $elementPathLabel = $pathLabel . ' / ' . $structureElement->getLabel();
            if ($structureElement instanceof AbstractComposite && $structureElement->hasChildren()) {
                $this->findInStructure($structureElement->getChildren(), $searchTerm, $elementPathLabel);
            }
        }
    }
}