@Override
        public String getSuggestFieldContents() {
            return "title,content";
        }

        @Override
        public String getSuggestFieldTags() {
            return "label";
        }

        @Override
        public String getSuggestFieldRoles() {
            return "role";
        }

        @Override

        split(fessConfig.getSuggestFieldContents(), ",")
                .of(stream -> stream.filter(StringUtil::isNotBlank).forEach(contentFieldNameSet::add));
        split(fessConfig.getSuggestFieldTags(), ",").of(stream -> stream.filter(StringUtil::isNotBlank).forEach(tagFieldNameSet::add));
        split(fessConfig.getSuggestFieldRoles(), ",").of(stream -> stream.filter(StringUtil::isNotBlank).forEach(roleFieldNameSet::add));