final SearchRequestBuilder builder = c.prepareSearch(index);
            callback.accept(builder);
            return builder.execute();
        });
        final OpenSearchResultList<T> targetList = new OpenSearchResultList<>();
        final SearchHits hits = response.getHits();
        final TotalHits totalHits = hits.getTotalHits();
        final long totalHitsValue = totalHits != null ? totalHits.value : 0;