/** The key of the configuration. e.g. bool */
    String QUERY_DEFAULT_query_type = "query.default.query_type";

    /** The key of the configuration. e.g. 0.1 */
    String QUERY_DISMAX_tie_breaker = "query.dismax.tie_breaker";

    /** The key of the configuration. e.g.  */
    String QUERY_BOOL_minimum_should_match = "query.bool.minimum_should_match";