I am not from the US, so I don't really care about how it does its things.

I definitely don't expect political purges on bureaucracy in my country of residence after elections, and I would consider it an extremely bad sign.

Typically the new party replaces the top levels; this is expected. Director of something, secretary of this and that, minister of something else, etc.

The actual bureacrats doing day to day work typically are not political agents. Getting rid of them for political reasons indicate loss of know-how, tacit knowledge, and competence, in the name of blind loyalty.

This was also true of the US. It’s expected to replace the Secretary of Defense and a variety of subordinate secretaries and undersecretaries like the Secretary of the Army with political leaders affiliated with the President’s party. Military officers at the highest level, such as the Chairman of the Joint Chiefs or the Chiefs of Staff of the respective branches, are somewhat political, but they are expected to be professionals chosen for merit. And below that level, it has historically been very frowned upon for political leadership to directly involve itself in the selection and promotion of flag officers beyond setting criteria and expectations.