Force Directed node update

Problems updating a dataItem in a Force Directed chart.

I have hierarchical data loaded from a json file. And want to update the category on specific nodes in realtime. But I am unable to apply the validateRawData() method, which I beleave is needed to apply the changes.

So I have an updateNode() method which runs from a time eg.


      function updateNode() {

          let node = findNodeByName(series.dataItems, "Node2");
          if (node) {
              // Hard coded values just for testing
              node.set("value", 555);
              node.set("name'", "Node2Updated");
              // Then tried various methods to apply the changes as commented below eg.
              //series.data.validateRawData();
              //node.get("value").invalidate();
              // etc...
          }
      }

And my find function eg.

      function findNodeByName(dataItems, nodeName) {

          for (let item of dataItems) {

              let name = item.get("category")
              if (name === nodeName) {
                console.log("Found node: '%s'", nodeName);
                return item; // Found the node
              }
              let children = item.get("children");
              if (children) {
                  let found = findNodeByName(children, nodeName);
                  if (found) {
                      console.log("Found: '%s'", nodeName);
                      return found;
                  }
              }
          }
          console.log("Not found: '%s'", nodeName);
          return null; // Node not found
      }