createWrittenEvent example

                'id' => Uuid::randomBytes(),
                'type' => 'equals',
                'field' => 'product.id',
                'value' => $productId,
                'position' => 2,
                'product_stream_id' => Uuid::fromHexToBytes($id),
                'created_at' => (new \DateTime())->format(Defaults::STORAGE_DATE_TIME_FORMAT),
            ]
        );

        $message = $this->indexer->update($this->createWrittenEvent($id));
        static::assertInstanceOf(EntityIndexingMessage::class, $message);
        $this->indexer->handle($message);

        /** @var ProductStreamEntity $entity */
        $entity = $this->productStreamRepository->search(new Criteria([$id]), $this->context)->get($id);
        static::assertNotNull($entity->getApiFilter());
        static::assertCount(2, $entity->getApiFilter());

        static::assertSame('equals', $entity->getApiFilter()[0]['type']);
        static::assertSame('product.manufacturerId', $entity->getApiFilter()[0]['field']);
        static::assertSame($manufacturerId, $entity->getApiFilter()[0]['value']);