code: public java.util.List<InstanceTypeConfig> getInstanceTypeConfigs() {
          if (instanceTypeConfigs == null) {
              instanceTypeConfigs = new com.amazonaws.internal.SdkInternalList<InstanceTypeConfig>();
          }
          return instanceTypeConfigs;
      }
docs: <p>
  The instance type configurations that define the EC2 instances in the instance fleet.
  </p>
  
  @return The instance type configurations that define the EC2 instances in the instance fleet.