For this, we will be using the python-bugzilla module

    pip install python-bugzilla

This provides 'bugzilla' command, which is the interface we'll be using.
bugzilla has a "modify" sub command which allows us to update a bug via the CLI.
The most important piece of this is to pass the following argument, which surpresses email updates.

   --field=minor_update=1

To update a single bug, you can either login via the 'login' subcommand or pass your username and password at run time.

    bugzilla login
    bugzilla modify --flag qa_ack+ --field=minor_update=1 12345678     (12345678) is the bug id

or

    bugzilla modify --username myname@redhat.com --password 12345 --flag qa_ack+ --field=minor_update=1 12345678

If you are doing multiple updates you can either add them all as space delimited entries on the end of the bugzilla command, or you can create a text file with all the ids.
The second option allows you to iterate over each id, to lessen the chances of a bugzilla timeout.

An example of how to update the qe_test_coverage flag to - for all bugs in the list.

    for id in $(cat bugids.txt); do echo $id && bugzilla modify --flag qe_test_coverage- --field=minor_update=1 $id; done