drop_op and drop_all wipes users

[FredrikMS]

Hi,
We have been experimenting with dgraph using the latest docker images. We wanted to create a fresh new graph so we decided to use the use the /alter endpoint with drop_op and drop_all options. They both seem to wipe the groot user and ACL, so we had to start over again by starting a new container.
Is this intentional?
In this blogpost you say these predicates should not be touched by a DropAll request:
https://discuss.dgraph.io/t/how-access-control-works-in-dgraph-dgraph-blog/4276

[matthewmcneely]

That article was a little vague about DROP_ALL. DROP_ALL clears everything: data, acl info, schema, data.... and then the groot (superuser) and guardian groups are recreated at the very end of the operation. So if you changed the default password, it gets reset to the default.

Perhaps you wanted to use DROP_DATA?