public static String prettyPrintJson(Node node, String indentString) {
        return NodeHandler.prettyPrint(node, indentString);
    }
Writes the contents of a Node to a pretty-printed JSON string.

@param node Node to write.
@param indentString String to use for indention.
@return Returns the serialized Node.
smithy-model/src/main/java/software/amazon/smithy/model/node/Node.java