Bubble Chart D3.v4 One Hierarchical Level

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<!DOCTYPE html>
<meta charset="utf-8">
<style>

text {
  font: 10px sans-serif;
}

</style>
<body>
<script src="//d3js.org/d3.v4.js"></script>
<script>

var diameter = 500,
    format = d3.format(",d"),
    color = "#FABE58";

var bubble = d3.pack()
    .size([diameter, diameter])
    .padding(2);

var svg = d3.select("body").append("svg")
    .attr("width", diameter)
    .attr("height", diameter)
    .attr("class", "bubble");

d3.json("data.json", function(error, data) {
  if (error) throw error;

var root = d3.hierarchy(clusters(data))
      .sum(function(d) { return d.value; })
      .sort(function(a, b) { return b.value - a.value; });

bubble(root);
  var node = svg.selectAll(".node")
      .data(root.children)
    .enter().append("g")
      .attr("class", "node")
      .attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; });

node.append("title")
      .text(function(d) { return d.data.clusterID + ": " + format(d.value); });

node.append("circle")
      .attr("r", function(d) { return d.r; })
      .style("fill", color);

node.append("text")
      .attr("dy", ".3em")
      .style("text-anchor", "middle")
      .text(function(d) { return d.data.clusterID.substring(0, d.r / 3); });
});

// Returns a flattened hierarchy containing all leaf nodes under the root.
function clusters(root) {
  var clusters = [];

function recurse(name, node) {

if (node.children) node.children.forEach(function(child) { recurse(node.name, child); });
    else clusters.push({topic: name, clusterID: node.name, value: node.size});
  }

recurse(null, root);
  return {children: clusters};
}

d3.select(self.frameElement).style("height", diameter + "px");

</script>

https://d3js.org/d3.v4.js