Bug 33348: Show authority heading use with Elasticsearch

Bug 33348: Show authority heading use with Elasticsearch

This patch ensures the ShowHeadingUse system preference and feature works as expected when using Elasticsearch as the searchengine.

To test, follow the test plan at Bug 29990 Comment 9. Ensure the SearchEngine system preference is set to Elasticsearch.

Sponsored-by: Education Services Australia SCIS
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Roman Dolny <roman.dolny@jezuici.pl>
Signed-off-by: Thomas Klausner <domm@plix.at>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>