EngineInterface.php

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

interface EngineInterface
{
    const FIELD_PREFIX = 'attr_';

    const SCOPE_IDENTIFIER = 'scope';

    const CONFIG_ENGINE_PATH = 'catalog/search/engine';

    public function getAllowedVisibility();

    public function allowAdvancedIndex();

    public function processAttributeValue($attribute, $value);

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