What they don't tell you...  here's a way to find out about fast InStream administration, progress and processing using a web-based interface.  I sort of found this by accident. It wasn't mentioned in any Documentum documentation.  Note: be sure the correct service is started. By default this Administration panel is turned off as a Windows service. Service to start is FAST InStream Web Server.

Use this URL below. I ran from Remote Desktop login but it may not matter if you connect locally or not:

http://localhost:16000/admin/

This assumes a default setup with 16000 as port.  What you will see here is a great deal of information about the server to be used for monitoring and even configuration.  Areas include a Collection overview, System overview, quick log access and loads of other good stuff. Typically a Documentum administrator would not need to access this fast InStream Admin panel but if you have indexing problems (ha, ha) or have done custom configurations to fulltext indexes you may need to monitor/configure through this Admin acces point. 

The image in Fig. 1 gives some idea of what you see