Hibernate Search: why .getResultsize is greater than .list().size()?

Question

The similar question was asked but not solved. Here is my code

FullTextSession fullTextSession = Search.getFullTextSession(currentSession());
QueryBuilder qb = fullTextSession.getSearchFactory()
          .buildQueryBuilder().forEntity(Design.class).get();
org.apache.lucene.search.Query query = qb
          .keyword()
          .onFields("designName", "description")
          .matching(text)
          .createQuery();
org.hibernate.search.FullTextQuery hibQuery =
        fullTextSession.createFullTextQuery(query, Design.class);
hibQuery.setFirstResult(start);
hibQuery.setMaxResults(num);

@SuppressWarnings("unchecked")
List<Design> designList = hibQuery.list();
for (Design design : designList) {
     Hibernate.initialize(design.getDesignImages());
}
return designList;

Why hibQuery.list().size() is smaller than hibQuery.getResultSize(). Because of this difference, the .setMaxResults() does not work properly.

Answer 1

A reason for this can be that the index and database are not in sync at the time of querying. getResultSize is based on the Lucene query result size whereas list.size() is the actual size of materialized (loaded) entities.