code: @Override
      public ListInstanceFleetsResult listInstanceFleets(ListInstanceFleetsRequest request) {
          request = beforeClientExecution(request);
          return executeListInstanceFleets(request);
      }
docs: <p>
  Lists all available details about the instance fleets in a cluster.
  </p>
  <note>
  <p>
  The instance fleet configuration is available only in Amazon EMR versions 4.8.0 and later, excluding 5.0.x
  versions.
  </p>
  </note>
  
  @param listInstanceFleetsRequest
  @return Result of the ListInstanceFleets operation returned by the service.
  @throws InternalServerException
  This exception occurs when there is an internal failure in the EMR service.
  @throws InvalidRequestException
  This exception occurs when there is something wrong with user input.
  @sample AmazonElasticMapReduce.ListInstanceFleets
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/elasticmapreduce-2009-03-31/ListInstanceFleets"
  target="_top">AWS API Documentation</a>