MC-16365: [2.1.x] Fix CompanyUserManagerInterfaceTest failing on mainline

Author: svitja

dev/tests/integration/testsuite/Magento/Customer/_files/two_customers.php

@@ -6,6 +6,10 @@
  * See COPYING.txt for license details.
  */
 
+use Magento\Framework\Indexer\IndexerInterface;
+use Magento\Framework\Indexer\IndexerRegistry;
+use Magento\Customer\Model\Customer;
+
 require 'customer.php';
 
 $customer = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()->create('Magento\Customer\Model\Customer');
@@ -25,3 +29,12 @@
 
 $customer->isObjectNew(true);
 $customer->save();
+
+/** @var IndexerRegistry $indexerRegistry */
+$indexerRegistry = $objectManager->create(IndexerRegistry::class);
+/** @var IndexerInterface $indexer */
+$indexer = $indexerRegistry->get(Customer::CUSTOMER_GRID_INDEXER_ID);
+try {
+    $indexer->reindexAll();
+} catch (\Exception $e) {
+}