code: protected Set<String> fetchDataFromLucene(Class<?> clazz, Client client)
      {
          // use lucene to query and get Pk's only.
          // go to client and get relation with values.!
          // populate EnhanceEntity
  
          /** The lucene query from jpa query. */
          String luceneQueryFromJPAQuery = KunderaCoreUtils.getLuceneQueryFromJPAQuery(kunderaQuery, kunderaMetadata);
  
          Map<String, Object> results = client.getIndexManager().search(clazz, luceneQueryFromJPAQuery);
          Set rSet = new HashSet(results.values());
          return rSet;
      }
docs: Fetch data from lucene.
  
  @param client
  the client
  @return the sets the