Engine.php

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

class Engine implements EngineInterface
{
    const ATTRIBUTE_PREFIX = 'attr_';

    const SCOPE_FIELD_NAME = 'scope';

    protected $catalogProductVisibility;

    private $indexScopeResolver;

    public function __construct(
        \Magento\Catalog\Model\Product\Visibility $catalogProductVisibility,
        \Magento\Framework\Indexer\ScopeResolver\IndexScopeResolver $indexScopeResolver
    ) {
        $this->catalogProductVisibility = $catalogProductVisibility;
        $this->indexScopeResolver = $indexScopeResolver;
    }

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

    public function allowAdvancedIndex()
    {
        return true;
    }

    private $termFilterableAttributeAttributeCache = [];

    private function isTermFilterableAttribute($attribute)
    {
        $attributeId = $attribute->getAttributeId();
        if (!isset($this->termFilterableAttributeAttributeCache[$attributeId])) {
            $this->termFilterableAttributeAttributeCache[$attributeId] =
                in_array($attribute->getFrontendInput(), ['select', 'multiselect'], true)
                && ($attribute->getIsVisibleInAdvancedSearch()
                    || $attribute->getIsFilterable()
                    || $attribute->getIsFilterableInSearch());
        }

        return $this->termFilterableAttributeAttributeCache[$attributeId];
    }

    public function processAttributeValue($attribute, $value)
    {
        $result = false;
        if ($attribute->getIsSearchable()
            && in_array($attribute->getFrontendInput(), ['text', 'textarea'])
        ) {
            $result = $value;
        } elseif ($this->isTermFilterableAttribute($attribute)) {
            $result = '';
        }

        return $result;
    }

    public function prepareEntityIndex($index, $separator = ' ')
    {
        $indexData = [];
        foreach ($index as $attributeId => $value) {
            $indexData[$attributeId] = is_array($value) ? implode($separator, $value) : $value;
        }
        return $indexData;
    }

    public function isAvailable()
    {
        return true;
    }
}