See the code in org.hibernate.search.elasticsearch.impl.ElasticsearchHSQueryImpl.IndexSearcher.getSort(SortField): we assume that "reverse" always means "DESC", but it's not true for score sorts.

The bug was hidden because of HSEARCH-2406 In Progress .

Note: there are tests that should pass when this ticket is resolved, and that are currently disabled with a `@Category(ElasticsearchSupportInProgress.class)` annotation. Those tests will be (or have been) outlined as part of HSEARCH-2406 In Progress .