Description of problem:

In section 3.4.3. - Object gateway guide [1] https://access.redhat.com/documentation/en-us/red_hat_ceph_storage/3/html-single/object_gateway_guide_for_red_hat_enterprise_linux/#configuring-bucket-index-sharding-in-multi-site-configurations-rgw

Configuring Bucket Index Sharding in Multi-site Configurations the parameter mentioned to configure bucket index sharding should be "bucket_index_max_shards" instead of "rgw_override_bucket_index_max_shards" as its clearly mentioned when we get the zonegroup.json configuration file :

# radosgw-admin zonegroup get 

[root@ceph-a1 ~]# radosgw-admin zonegroup get 
{
    "id": "44237e94-fb59-42e8-91a3-67fec8cbdcab",
    "name": "us",
    "api_name": "us",
    "is_master": "true",
    "endpoints": [
        "http://ceph-a1:8080"
    ],
    "hostnames": [],
    "hostnames_s3website": [],
    "master_zone": "e0481c22-ce02-4b44-a16c-c0f9174ef6d0",
    "zones": [
        {
            "id": "e0481c22-ce02-4b44-a16c-c0f9174ef6d0",
            "name": "california",
            "endpoints": [
                "http://ceph-a1.test.com:8080"
            ],
            "log_meta": "false",
            "log_data": "false",
            "bucket_index_max_shards": 10,     <<<<< This parameter
            "read_only": "false",
            "tier_type": "",
            "sync_from_all": "true",
            "sync_from": []
        }
    ],
    "placement_targets": [
        {
            "name": "default-placement",
            "tags": []
        }
    ],
    "default_placement": "default-placement",
    "realm_id": "e36bc62c-d043-42b8-8e3d-c789508a613d"
}

The parameter should be corrected in the whole section [3.4.3]