Engine.php

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

use Magento\CatalogSearch\Model\ResourceModel\EngineInterface;
use Magento\Catalog\Model\Product\Visibility;
use Magento\Framework\Indexer\ScopeResolver\IndexScopeResolver;

class Engine implements EngineInterface
{
    protected $catalogProductVisibility;

    private $indexScopeResolver;

    public function __construct(
        Visibility $catalogProductVisibility,
        IndexScopeResolver $indexScopeResolver
    ) {
        $this->catalogProductVisibility = $catalogProductVisibility;
        $this->indexScopeResolver = $indexScopeResolver;
    }

    public function getAllowedVisibility()
    {
        return $this->catalogProductVisibility->getVisibleInSiteIds();
    }

    public function allowAdvancedIndex()
    {
        return false;
    }

    public function processAttributeValue($attribute, $value)
    {
        return $value;
    }

    public function prepareEntityIndex($index, $separator = ' ')
    {
        return $index;
    }

    public function isAvailable()
    {
        return true;
    }
}