The Lucene backend has a lot of configurability option (storage, commit policy and so on): they need to be restored.

This includes, but is not limited to:

• The near-real-time feature: https://docs.jboss.org/hibernate/search/5.11/reference/en-US/html_single/#_near_real_time

• The reader strategy: https://docs.jboss.org/hibernate/search/5.11/reference/en-US/html_single/#configuration-reader-strategy

• The writer configuration: https://docs.jboss.org/hibernate/search/5.11/reference/en-US/html_single/#lucene-indexing-performance

• Probably much more! Let's scan the Search 5 codebase for other configuration property keys.

IMPORTANT: Not all configuration options are still relevant. In some cases there's a single best option and we should stick to that. Ask Sanne what we should keep!