code: @Override
      public StartInstancesResult startInstances(StartInstancesRequest request) {
          request = beforeClientExecution(request);
          return executeStartInstances(request);
      }
docs: <p>
  Starts an Amazon EBS-backed instance that you've previously stopped.
  </p>
  <p>
  Instances that use Amazon EBS volumes as their root devices can be quickly stopped and started. When an instance
  is stopped, the compute resources are released and you are not billed for instance usage. However, your root
  partition Amazon EBS volume remains and continues to persist your data, and you are charged for Amazon EBS volume
  usage. You can restart your instance at any time. Every time you start your Windows instance, Amazon EC2 charges
  you for a full instance hour. If you stop and restart your Windows instance, a new instance hour begins and
  Amazon EC2 charges you for another full instance hour even if you are still within the same 60-minute period when
  it was stopped. Every time you start your Linux instance, Amazon EC2 charges a one-minute minimum for instance
  usage, and thereafter charges per second for instance usage.
  </p>
  <p>
  Before stopping an instance, make sure it is in a state from which it can be restarted. Stopping an instance does
  not preserve data stored in RAM.
  </p>
  <p>
  Performing this operation on an instance that uses an instance store as its root device returns an error.
  </p>
  <p>
  For more information, see <a href="https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/Stop_Start.html">Stopping
  Instances</a> in the <i>Amazon Elastic Compute Cloud User Guide</i>.
  </p>
  
  @param startInstancesRequest
  @return Result of the StartInstances operation returned by the service.
  @sample AmazonEC2.StartInstances
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/ec2-2016-11-15/StartInstances" target="_top">AWS API
  Documentation</a>