return QueryBuilders.matchPhraseQuery(f, text);
        }

        final UnicodeBlock block = UnicodeBlock.of(text.codePointAt(0));
        if (block == UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS //
                || block == UnicodeBlock.HIRAGANA //
                || block == UnicodeBlock.KATAKANA //
                || block == UnicodeBlock.HANGUL_SYLLABLES //
        ) {
            return QueryBuilders.prefixQuery(f, text);

        processDBFluteSystem();
    }

    protected void processDBFluteSystem() {
        DBFluteSystem.unlock();
        DBFluteSystem.setFinalTimeZoneProvider(createFinalTimeZoneProvider());
        DBFluteSystem.lock();
    }

    protected DfFinalTimeZoneProvider createFinalTimeZoneProvider() {
        return new DfFinalTimeZoneProvider() {
            protected final TimeZone provided = FessUserTimeZoneProcessProvider.centralTimeZone;