how to remove gattserver and/or gatt client ?

[jumjum123]

There are some examples, how to build up a BLE server and a BLE client.
But how would I get rid of a BLE server (client), in case it needs to build up again with different ids, or for whatever reason ?
Does esp_ble_gatts_app_unregister remove everything, or do we need to remove everything like descriptors etc, from bottom up ?
Is there a way to unregister callback ?