* Refactor descendant enumeration in DeliveryApiContentIndexHelper
Improved loop condition to allow for processing of more than 10.000 descendants for indexing.
* Add failing test for original issue.
* Renamed variable for clarity.
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Co-authored-by: Brynjar Þorsteinsson <brynjar@vettvangur.is>
Co-authored-by: Andy Butland <abutland73@gmail.com>