FIND-5191 has multiple flaws

Description

Fixed issues introduced with bugfix https://world.optimizely.com/support/bug-list/bug/FIND-5191

This change was intended to address an issue with child content not being updated when the URL segment of the parent content was changed. However, it did not achieve the desired result and can sometimes be very resource-intensive.

To address this, the following changes were implemented:

• Child content is now only indexed when the URL segment changes, rather than on all updates.
• Child content is added to the indexing queue to prevent freezing of the queue processing.