EngineProvider.php

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

use Magento\Framework\Search\EngineResolverInterface;

class EngineProvider
{
    const CONFIG_ENGINE_PATH = 'catalog/search/engine';

    protected $engine;

    protected $scopeConfig;

    private $objectManager;

    private $enginePool;

    private $engineResolver;

    public function __construct(
        \Magento\Framework\ObjectManagerInterface $objectManager,
        array $engines,
        EngineResolverInterface $engineResolver
    ) {
        $this->objectManager = $objectManager;
        $this->enginePool = $engines;
        $this->engineResolver = $engineResolver;
    }

    public function get()
    {
        if (!$this->engine) {
            $currentEngine = $this->engineResolver->getCurrentSearchEngine();
            if (!isset($this->enginePool[$currentEngine])) {
                throw new \LogicException(
                    'There is no such engine: ' . $currentEngine
                );
            }
            $engineClassName = $this->enginePool[$currentEngine];

            $engine = $this->objectManager->create($engineClassName);
            if (false === $engine instanceof EngineInterface) {
                throw new \LogicException(
                    $currentEngine . ' doesn\'t implement ' . EngineInterface::class
                );
            }

            if ($engine && !$engine->isAvailable()) {
                throw new \LogicException(
                    'Engine is not available: ' . $currentEngine
                );
            }
            $this->engine = $engine;
        }

        return $this->engine;
    }
}