Wait Flush, Wait Searcher and commit Scenarios

[Grant Ingersoll]

Was wondering if anyone can fill me in on the when and why I would set  
waitFlush and waitSearcher to false when sending a commit command?  I  
think I understand what they do technically (I've looked at the code),  
but I am not clear about why I would want to do it.  Is there a risk  
in setting them to false? Wouldn't my response return a lot faster if  
it was set to false?  Yet, the default is true for both, so I assume  
there is a reason I want to wait...

Thanks,
Grant