code: public void unbind() throws Exception {
          InstanceInfo myInfo = applicationInfoManager.getInfo();
          String myInstanceId = ((AmazonInfo) myInfo.getDataCenterInfo()).get(AmazonInfo.MetaDataKey.instanceId);
  
          AmazonEC2 ec2 = getEC2Service();
  
          List<InstanceNetworkInterface> result = instanceData(myInstanceId, ec2).getNetworkInterfaces();
  
          List<String> ips = getCandidateIps();
  
          for(InstanceNetworkInterface networkInterface: result){
              if (ips.contains(networkInterface.getPrivateIpAddress())) {
                  String attachmentId = networkInterface.getAttachment().getAttachmentId();
                  ec2.detachNetworkInterface(new DetachNetworkInterfaceRequest().withAttachmentId(attachmentId));
                  break;
              }
          }
      }
docs: Unbind the IP that this instance is associated with.