/** The key of the configuration. e.g. -1 */
    String QUERY_HIGHLIGHT_FRAGMENT_OFFSET = "query.highlight.fragment.offset";

    /** The key of the configuration. e.g. 0 */
    String QUERY_HIGHLIGHT_NO_MATCH_SIZE = "query.highlight.no.match.size";

    /** The key of the configuration. e.g. score */
    String QUERY_HIGHLIGHT_ORDER = "query.highlight.order";

    /** The key of the configuration. e.g. 256 */

        } catch (final Exception e) {
            throw new FessSystemException("Failed to parse project.properties.", e);
        }
    }

    @PreDestroy
    public void destroy() {
        shutdownHookList.forEach(action -> {
            try {
                action.run();
            } catch (final Exception e) {

query.highlight.boundary.max.scan=20
query.highlight.boundary.scanner=chars
query.highlight.encoder=default
query.highlight.force.source=false
query.highlight.fragmenter=span
query.highlight.fragment.offset=-1
query.highlight.no.match.size=0
query.highlight.order=score
query.highlight.phrase.limit=256
query.highlight.content.description.fields=hl_content,digest
query.highlight.boundary.position.detect=true
query.highlight.text.fragment.type=query

                "fess_config.failure_url", //
                "fess_config.file_authentication", //
                "fess_config.file_config", //
                "fess_config.job_log", //
                "fess_config.key_match", //
                "fess_config.label_type", //
                "fess_config.path_mapping", //
                "fess_config.related_content", //
                "fess_config.related_query", //