arangosh> db._create("users", { keyOptions: { allowUserKeys: false } });
[ArangoCollection 110143, "users" (type document, status loaded)]
arangosh> db.users.save({ name: "user 1" });
{
"_id" : "users/110150",
"_key" : "110150",
"_rev" : "_Y2g66Hy--_"
}
arangosh> db.users.save({ name: "user 2", _key: "myuser" });
[ArangoError 1222: unexpected document key]
arangosh> db.users.save({ name: "user 3" });
{
"_id" : "users/110155",
"_key" : "110155",
"_rev" : "_Y2g66H2--_"
}