Ceph - After upgrading from RHCS 1.3.x(hammer) to RHCS 2.x(jewel) we can not add new radosgw users

Issue

• After upgrading from RHCS 1.3.x(hammer) to RHCS 2.x(jewel) we can not add new radosgw users.

# radosgw-admin  user create --uid testuser --display-name=testuser
2017-01-31 12:04:08.386042 7f4f1793e9c0  0 System already converted 
2017-01-31 12:04:08.528722 7f4f1793e9c0  0 ERROR: rgw_put_system_obj() oid=.meta:user:testuser:_WxrhPCLjKlPGSwhqf9fvhlm:1) returned ret=-22
could not create user: unable to create user, unable to store user info
2017-01-31 12:04:08.528730 7f4f1793e9c0  0 ERROR: put_entry: store_in_heap() key=testuser returned ret=-22

• Zone configuration:

# radosgw-admin zone get --rgw-zone=default
{
    "id": "default",
    "name": "default",
    "domain_root": ".rgw",
    "control_pool": ".rgw.control",
    "gc_pool": ".rgw.gc",
    "log_pool": ".log",
    "intent_log_pool": ".intent-log",
    "usage_log_pool": ".usage",
    "user_keys_pool": ".users",
    "user_email_pool": ".users.email",
    "user_swift_pool": ".users.swift",
    "user_uid_pool": ".users.uid",
    "system_key": {
        "access_key": "",
        "secret_key": ""
    },
    "placement_pools": [
        {
            "key": "default-placement",
            "val": {
                "index_pool": ".rgw.buckets.index",
                "data_pool": ".rgw.buckets",
                "data_extra_pool": ".rgw.buckets.extra",
                "index_type": 0
            }
        }
    ],
    "metadata_heap": "",
    "realm_id": ""
}