EDIT

Lucene 6+ seems to require hs6+ as there is a strange dependency on org.apache.lucene.document.Field.Index and ...Field.TermVector which creates runtime ClassNotFound exceptions even when trying to avoid classes like eu.etaxonomy.cdm.hibernate.search.IdFieldOptions.
This is because the lucene interface LuceneOptions still uses these classes as return type though they do not exist anymore.

But maybe it is possible to fully remove LuceneOptions and solve the problem this way (hmm, probably not possible because it is used in the org.hibernate.search.bridge.FieldBridge interface).

https://hibernate.org/search/documentation/migrate/
https://docs.jboss.org/hibernate/search/6.0/migration/html_single/
https://docs.jboss.org/hibernate/stable/search/reference/en-US/html_single/
https://lucene.apache.org/core/8_0_0/changes/Changes.html#v8.0.0.api_changes
https://lucene.apache.org/core/7_3_1/core/org/apache/lucene/index/IndexOptions.html
https://lucene.apache.org/core/5_4_1/core/org/apache/lucene/document/Field.TermVector.html

Luke:
https://github.com/DmitryKey/luke/releases
Starting from lucene 8 luke is included in lucene: https://lucene.apache.org/core/downloads.html