throw new UnsupportedOperationException("getSimilarDocHash() is not supported in this implementation");
        }

        @Override
        public HighlightInfo getHighlightInfo() {
            return new HighlightInfo();
        }
    }

    @Override
    protected void writeHeaders(final HttpServletResponse response) {

        /**
         * Sets the highlighting information.
         *
         * @param highlightInfo the highlighting configuration
         * @return this builder for method chaining
         */
        public SearchConditionBuilder highlightInfo(final HighlightInfo highlightInfo) {
            this.highlightInfo = highlightInfo;
            return this;
        }

        /**