[BUG] Searches fail unless the complete Solr index is rebuilt

[sebastian-meyer]

https://github.com/kitodo/kitodo-presentation/pull/1796/changes/BASE..f539e6164165aa3929656718d50de97dca1fafc3#diff-fdf63d957c2e6980320971efb66ff8015351483bbd5021e474e97226689107c7R259

Searches now fail with an Oops unless the complete Solr index is rebuilt. I fixed it locally with self::$fields['structure_path'] = $solrFields['structurePath'] ?? '';.

Originally posted by @stweil in #1796 (comment)