IndexStructureProxy.php

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

use Magento\Framework\Indexer\IndexStructureInterface;

class IndexStructureProxy implements IndexStructureInterface
{
    private $indexStructureEntity;

    private $indexStructureFactory;

    public function __construct(
        IndexStructureFactory $indexStructureFactory
    ) {
        $this->indexStructureFactory = $indexStructureFactory;
    }

    public function delete(
        $index,
        array $dimensions = []
    ) {
        return $this->getEntity()->delete($index, $dimensions);
    }

    public function create(
        $index,
        array $fields,
        array $dimensions = []
    ) {
        return $this->getEntity()->create($index, $fields, $dimensions);
    }

    private function getEntity()
    {
        if (empty($this->indexStructureEntity)) {
            $this->indexStructureEntity = $this->indexStructureFactory->create();
        }
        return $this->indexStructureEntity;
    }
}