default void unsubscribe(String path, Set<String> keys, ConfigChangeCallback callback) {
        throw new UnsupportedOperationException();
    }
Unsubscribes to changes for the given keys at the given path (optional operation).

@param path the path where the data resides
@param keys the keys whose values will be retrieved
@param callback the callback to be unsubscribed from changes
@throws UnsupportedOperationException if the unsubscribe operation is not supported
clients/src/main/java/org/apache/kafka/common/config/provider/ConfigProvider.java