String QUERY_HIGHLIGHT_BOUNDARY_SCANNER = "query.highlight.boundary.scanner";

    /** The key of the configuration. e.g. default */
    String QUERY_HIGHLIGHT_ENCODER = "query.highlight.encoder";

    /** The key of the configuration. e.g. false */
    String QUERY_HIGHLIGHT_FORCE_SOURCE = "query.highlight.force.source";

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