code: @Override
      public ExecutePolicyResult executePolicy(ExecutePolicyRequest request) {
          request = beforeClientExecution(request);
          return executeExecutePolicy(request);
      }
docs: <p>
  Executes the specified policy.
  </p>
  
  @param executePolicyRequest
  @return Result of the ExecutePolicy operation returned by the service.
  @throws ScalingActivityInProgressException
  The operation can't be performed because there are scaling activities in progress.
  @throws ResourceContentionException
  You already have a pending update to an Amazon EC2 Auto Scaling resource (for example, an Auto Scaling
  group, instance, or load balancer).
  @sample AmazonAutoScaling.ExecutePolicy
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/autoscaling-2011-01-01/ExecutePolicy" target="_top">AWS API
  Documentation</a>