arangosh> db._create("users", { keyOptions: { allowUserKeys: false } });
[ArangoCollection 109758, "users" (type document, status loaded)]
arangosh> db.users.save({ name: "user 1" });
{
"_id" : "users/109765",
"_key" : "109765",
"_rev" : "_YOn1dMC--_"
}
arangosh> db.users.save({ name: "user 2", _key: "myuser" });
[ArangoError 1222: unexpected document key]
arangosh> db.users.save({ name: "user 3" });
{
"_id" : "users/109770",
"_key" : "109770",
"_rev" : "_YOn1dMC--C"
}