Disabling early uploads of access logs is not recommended because this might result in a loss of access logs when the disk is full.
If there is a reasonable need for this, it can be done by setting the value to 0 (zero) :
edit log main ;mode
client-type ftp
early-upload 0 <<<<<
exit
In the Event Logs, you should see the following entry :
2012-12-13 16:04:05-00:00UTC "Config admin at 10.10.10.10 'admin', access log early uploads have been disabled for log main" 0 140002:7D cli_parse.hpp:268