/** The key of the configuration. e.g. 2 */
    String QUERY_HIGHLIGHT_NUMBER_OF_FRAGMENTS = "query.highlight.number.of.fragments";

    /** The key of the configuration. e.g. fvh */
    String QUERY_HIGHLIGHT_TYPE = "query.highlight.type";

    /** The key of the configuration. e.g. <strong> */
    String QUERY_HIGHLIGHT_TAG_PRE = "query.highlight.tag.pre";