@Override
    public void postInitialize(String configId) {
        Map<String, Node> children = getChildrenWithVectorsFlattened();
        for (Node node : children.values()) {
            node.postInitialize(configId);
        }
    }
Overrides {@link Node#postInitialize(String)}.
Perform post initialization on this node's children.

@param configId The config id of this instance.
config-lib/src/main/java/com/yahoo/config/InnerNode.java