Non-GUI operation in metaServlet
MetaServlet is a REST webservice that allows you to administrate Talend Administration Center
         programmatically. You can connect to Talend Administration Center and
         perform actions there, for example, launching a Job, by calling the MetaServlet from an
         external scheduler.
      Information noteNote: 
            
When accessing Talend Administration Center via the MetaServlet, the returned data does not include password information by default.
You can add the following parameter in
                  org.talend.administrator/WEB-INF/classes/configuration.properties,
               then restart Talend Administration Center.
         scheduler.conf.metaservlet.repo.creds.return=trueFor information about how to launch metaServlet, the JSON parameters and the
        help command, see: