private void clear(Collection<K> keys) {
        keys.forEach(key -> {
            lookupMap.remove(key);
            fulfillmentMap.remove(key);
        });
    }
Disassociate a key from the currently mapped brokerId. This will send the key
back to the Lookup stage, which will allow us to attempt lookup again.
clients/src/main/java/org/apache/kafka/clients/admin/internals/AdminApiDriver.java