Mode.php

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<?php
namespace Magento\Catalog\Model\Indexer\Category\Flat\System\Config;

class Mode extends \Magento\Framework\App\Config\Value
{
    protected $indexerState;

    protected $indexerRegistry;

    public function __construct(
        \Magento\Framework\Model\Context $context,
        \Magento\Framework\Registry $registry,
        \Magento\Framework\App\Config\ScopeConfigInterface $config,
        \Magento\Framework\App\Cache\TypeListInterface $cacheTypeList,
        \Magento\Framework\Indexer\IndexerRegistry $indexerRegistry,
        \Magento\Indexer\Model\Indexer\State $indexerState,
        \Magento\Framework\Model\ResourceModel\AbstractResource $resource = null,
        \Magento\Framework\Data\Collection\AbstractDb $resourceCollection = null,
        array $data = []
    ) {
        parent::__construct($context, $registry, $config, $cacheTypeList, $resource, $resourceCollection, $data);
        $this->indexerRegistry = $indexerRegistry;
        $this->indexerState = $indexerState;
    }

    public function afterSave()
    {
        $this->_getResource()->addCommitCallback([$this, 'processValue']);
        return parent::afterSave();
    }

    public function processValue()
    {
        if ((bool)$this->getValue() != (bool)$this->getOldValue()) {
            if ((bool)$this->getValue()) {
                $this->indexerState->loadByIndexer(\Magento\Catalog\Model\Indexer\Category\Flat\State::INDEXER_ID);
                $this->indexerState->setStatus(\Magento\Framework\Indexer\StateInterface::STATUS_INVALID);
                $this->indexerState->save();
            } else {
                $this->indexerRegistry->get(\Magento\Catalog\Model\Indexer\Category\Flat\State::INDEXER_ID)
                    ->setScheduled(false);
            }
        }
    }
}