code: public LogLevel getLogLevel() {
          String logLevel = getLogLevelName();
  
          if ("debug".equalsIgnoreCase(logLevel)) {
              return LogLevel.DEBUG;
          } else if ("info".equalsIgnoreCase(logLevel)) {
              return LogLevel.INFO;
          } else if ("warning".equalsIgnoreCase(logLevel)) {
              return LogLevel.WARNING;
          } else if ("error".equalsIgnoreCase(logLevel) || "severe".equalsIgnoreCase(logLevel)) {
              return LogLevel.SEVERE;
          } else if ("off".equalsIgnoreCase(logLevel)) {
              return LogLevel.OFF;
          } else {
              throw new UnexpectedLiquibaseException("Unknown log level: " + logLevel+".  Valid levels are: debug, info, warning, error, off");
          }
      }
docs: Transforms the strings DEBUG, INFO, WARNING, ERROR and OFF (case-insensitive) into the appropriate LogLevel.
  @return a value from the LogLevel enum