code: public void forceLeave(String node) {
  
          final URI uri = createURI("/force-leave/" + node);
          final HTTP.Response httpResponse = HTTP.getResponse(uri.toString());
  
          if (httpResponse.code() != 200) {
              die("Unable to force leave", uri, httpResponse.code(), httpResponse.body());
          }
      }
docs: GET /v1/agent/force-leave/{node}
  <p>
  Instructs the agent to force a node into the "left" state.
  
  @param node node