The documentation states that most of the query parameters are deprecated and are replaced with the new filter query param with SCIM-syntax. It would be good to support the filter parameter and update the documentation so that it's possible to filter on the deprecated query parameters.
GET/users
https://qlik.dev/apis/rest/users/#%23%2Fentries%2Fusers-get
I have discussed this with Andrée Hansson about this on Qlik Branch slack.