* @param operation {@code <operation>} path, really an {@link ApiPath} to an {@code rpc}
* @param body RPC operation
* @return A {@link RestconfFuture} completing with {@link InvokeResult}
* @param operation {@code <operation>} path, really an {@link ApiPath} to an {@code rpc}
* @param body RPC operation
* @return A {@link RestconfFuture} completing with {@link InvokeResult}