.get(stream -> stream.map(s -> s.trim().toUpperCase(Locale.ENGLISH)).collect(Collectors.toSet()));
    }

    String getQueryTrackTotalHits();

    default Object getQueryTrackTotalHitsValue() {
        Object value = propMap.get(QUERY_TRACK_TOTAL_HITS_VALUE);
        if (value == null) {
            final String v = getQueryTrackTotalHits();
            if (Constants.TRUE.equalsIgnoreCase(v)) {

                    return;
                } catch (final NumberFormatException e) {
                    // ignore
                }
            }
            final Object trackTotalHitsValue = fessConfig.getQueryTrackTotalHitsValue();
            if (trackTotalHitsValue instanceof Boolean) {
                searchRequestBuilder.setTrackTotalHits((Boolean) trackTotalHitsValue);
            } else if (trackTotalHitsValue instanceof Number) {