reindex after post api magento 2

1$objectManager = \Magento\Framework\App\ObjectManager::getInstance();
2    $indexerCollectionFactory = $objectManager->get("\Magento\Indexer\Model\Indexer\CollectionFactory");
3    $indexerFactory = $objectManager->get("\Magento\Indexer\Model\IndexerFactory");
4
5    $indexerCollection = $indexerCollectionFactory->create();
6    $allIds = $indexerCollection->getAllIds();
7    foreach ($allIds as $id) {
8        $indexer = $indexerFactory->create()->load($id);
9        $indexer->reindexAll();
10    }

1<?php
2
3namespace Sark\CustomApi\Model;
4
5class CustomRepository implements Sark\CustomApi\Api\CustomRepositoryInterface
6{
7    /**
8     * @var \Magento\Framework\Indexer\IndexerRegistry
9     */
10    private $indexerRegistry;
11    /**
12     * @var \Magento\Indexer\Model\ResourceModel\Indexer\State\CollectionFactory
13     */
14    private $stateCollectionFactory;
15
16    public function __construct(
17        \Magento\Framework\Indexer\IndexerRegistry $indexerRegistry,
18        \Magento\Indexer\Model\ResourceModel\Indexer\State\CollectionFactory $stateCollectionFactory
19    ) {
20        $this->indexerRegistry = $indexerRegistry;
21        $this->stateCollectionFactory = $stateCollectionFactory;
22    }
23
24    public function create()
25    {
26        $indexerStates = $this->stateCollectionFactory->create();
27        foreach ($indexerStates->getItems() as $indexerState) {
28            $indexerState->getIndexerId();
29            $indexer = $this->indexerRegistry->get($indexerState->getIndexerId());
30            if ($indexer->getId() && !$indexer->isWorking()) {
31                $indexer->setScheduled(true);
32            }
33        }
34    }
35}