Layout builder cache not working as intended with many index's

Problem/Motivation

When there is more than one index present in the Drupal, there will be problems if their configuration isn't the same in their blocks selected from the form.

Steps to reproduce

1. Create two index's.
2. Choose diferent blocks to index from the form (IMPORTANT:this is where the problem ocurs).
3. If you try to reach a block wich is not in one of the two index's selected, you may find yourself that you can't add his fields.

Why does it happen?

Because the actual cache system configured doesn't differentiate between index's.

Proposed resolution

I have created a patch to resolve this by using the index id to cache by index.