Elastic Stock cannot find product stock for configurable children

[eerohakio]

Release: Vue Storefront API 1.11.0

Steps to reproduce:

1. Go to configurable product page

Expected result:

• Stock is found for product

Actual result:

• Stock cannot be found and error message "No stock information for given sku" is shown

Cause:

• Elastic stock tries to find child product of configurable and filtering results with term visibility: [2, 3, 4]
• Child products are set with visibility 1

Fix:

• Remove visibility filter for stock fetching

[pkarw]

Thanks! Can you please propose a PR with a fix for that?