This PR piggy-backs on recent changes in Lucene 9.11.1
(https://github.com/apache/lucene/pull/12829,
https://github.com/apache/lucene/pull/13341/), setting the parent doc
when nested fields are present. This allows moving nested documents
along with parent ones during sorting.
With this change, sorting is now allowed on fields outside nested
objects. Sorting on fields within nested objects is still not supported
(throws an exception).
Fixes#107349
6ae652f90e