AdminSearcher example

$indexer = new ProductAdminSearchIndexer(
            $this->createMock(Connection::class),
            $this->createMock(IteratorFactory::class),
            $this->createMock(EntityRepository::class),
            100,
        );
        $this->registry->method('getIndexers')->willReturn(['product' => $indexer]);
        $this->registry->method('getIndexer')->willReturn($indexer);

        $searchHelper = new AdminElasticsearchHelper(true, false, 'sw-admin');
        $this->searcher = new AdminSearcher($this->client, $this->registry, $searchHelper, '5s', 20);
    }

    public function testElasticSearch(): void
    {
        $this->client
            ->expects(static::once())
            ->method('msearch')
            ->with([
                'body' => [
                    [
                        'index' => 'sw-admin-product-listing',
                    ],