Some information related to the docman plugin are given in the key additional_information.
This raise concern about the usability of the REST route (there is no way to know what will be present in additional_information and how it will be formatted) and performance (see
gerrit #15671).
As the information given on this endpoint was mostly undocumented and the fact that API users has always needed to check if the docman information were present or not, a breaking change is going to be introduced to solve those concerns.
It should be noted that the information given in additional_information are also accessible via the resources key, API users should migrate.