anchor.diff:  
     config = mkIf cfg.enable {
       systemd.services.logstash = with pkgs; {
  -      description = "Logstash daemon";
  +      description = "Logstash Daemon";
         wantedBy = [ "multi-user.target" ];
   
         serviceConfig = {
  
positive.code:           output {
              ${cfg.outputConfig}
            }
          ''}";
        };
      };
    };
  
negative.code:       enable = mkOption {
          default = false;
          description = "Enable logstash";
        };
  
        enableWeb = mkOption {
          default = false;
          description = "Enable logstash web interface";
        };
  
        inputConfig = mkOption {
  