How to Reindexing Programmatically In Magento 2?

Use below code in any class for reindexing in magento2.

/**
* @var \Magento\Indexer\Model\IndexerFactory
*/
protected $_indexerFactory;
/**
* @var \Magento\Indexer\Model\Indexer\CollectionFactory
*/
protected $_indexerCollectionFactory;

public function __construct(
\Magento\Indexer\Model\IndexerFactory $indexerFactory,
\Magento\Indexer\Model\Indexer\CollectionFactory $indexerCollectionFactory
){
$this->_indexerFactory = $indexerFactory;
$this->_indexerCollectionFactory = $indexerCollectionFactory;
}
// you can call this function to do reindexing
public function reIndexing(){
$indexerCollection = $this->_indexerCollectionFactory->create();
$ids = $indexerCollection->getAllIds();
foreach ($ids as $id) {
$idx = $this->_indexerFactory->create()->load($id);
$idx->reindexAll($id); // this reindexes all
//$idx->reindexRow($id); // or you can use reindexRow according to your need
}

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