Indexer.php

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<?php
namespace Magento\Indexer\App;

use Magento\Framework\App;
use Magento\Framework\App\Filesystem\DirectoryList;

class Indexer implements \Magento\Framework\AppInterface
{
    protected $reportDir;

    protected $filesystem;

    protected $_response;

    public function __construct(
        $reportDir,
        \Magento\Framework\Filesystem $filesystem,
        \Magento\Indexer\Model\Processor $processor,
        \Magento\Framework\App\Console\Response $response
    ) {
        $this->reportDir = $reportDir;
        $this->filesystem = $filesystem;
        $this->processor = $processor;
        $this->_response = $response;
    }

    public function launch()
    {
        /* Clean reports */
        $directory = $this->filesystem->getDirectoryWrite(DirectoryList::ROOT);
        $path = $directory->getRelativePath($this->reportDir);
        if ($directory->isExist($path)) {
            $directory->delete($path);
        }

        /* Regenerate all indexers */
        $this->processor->reindexAll();
        $this->_response->setCode(0);

        return $this->_response;
    }

    public function catchException(App\Bootstrap $bootstrap, \Exception $exception)
    {
        return false;
    }
}