title: Gremlin update existing property
body: <p>How do I update an existing property of a node in a graph using Gremlin?</p>
  
  <p>The following method creates two properties "timestamp" with 2 different values, instead of updating the existing property "timestamp":</p>
  
  <pre><code>ContentGraph.g.addV('Filter').property('timestamp', new Date());
  ContentGraph.g.V().hasLabel('Filter').property('timestamp', new Date());
  </code></pre>