I need to import 40,000 product from xls so that reason I wrote an importer, I already did for magento 1.x but we switch our web site magento 2,
I can create simple and configurable product programatically but I cant associate simple product to configurable product, This is the best documentation I followed,

https://magento.stackexchange.com/questions/83107/programmatically-create-a-configurable-magento2-product

But I stuck configurable product options always throw an error,

    Call to a member function getId() on array in .../vendor/magento/module-configurable-product/Model/Plugin/AroundProductRepositorySave.php on line 109

Here is my code,

    $configurableProductOptions = [
	[
	"attribute_id" =>  137,
	"label" => 'size',
	"position" => 0,
	"values" => [
	[
	"value_index" =>  333,
	],
	[
	"value_index" =>  334,
	]
	],
	]
	];
	
	$product->setCanSaveConfigurableAttributes(true);
	$product->setCanSaveCustomOptions(true);
	$productExtensionFactory= $objectManager->create('\Magento\Catalog\Api\Data\ProductExtensionFactory');
	$productExtension = $productExtensionFactory->create();
	$productExtension->setConfigurableProductLinks($sipmle_product_ids);
	$productExtension->setConfigurableProductOptions([
													$configurableProductOptions
													 ]);
	$product->setExtensionAttributes($productExtension);
	$productRepository = $objectManager->create(Magento\Catalog\Api\ProductRepositoryInterface::class);

	$productRepository->save($product,true);

I m totaly sure something wrong in '$configurableProductOptions' tried almost everything but didnt succeed any ideas or anyone can share code to associate simple product as a configurable I can figured out from that code.