ShowOutOfStockConfig.php

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<?php
namespace Magento\Catalog\Model\Plugin;

class ShowOutOfStockConfig
{
    protected $_eavIndexerProcessor;

    public function __construct(\Magento\Catalog\Model\Indexer\Product\Eav\Processor $eavIndexerProcessor)
    {
        $this->_eavIndexerProcessor = $eavIndexerProcessor;
    }

    public function afterSave(\Magento\Framework\App\Config\Value $subject, $result)
    {
        if ($subject->isValueChanged()) {
            $this->_eavIndexerProcessor->markIndexerAsInvalid();
        }
        return $result;
    }
}