Need to cover InventoryCatalog search with integration tests

[naydav]

Testcases for coverage:
Product is located on NOT default stock and achievable via search
Configurable Product is located on NOT default stock and achievable via search

Something like
\Magento\CatalogSearch\Model\Indexer\FulltextTest
but products should be located on not Default stock (need to check case when the product is out of stock on specific stock)

[naydav]

#597