code: public java.util.List<InstanceTypeSpecification> getInstanceTypeSpecifications() {
          if (instanceTypeSpecifications == null) {
              instanceTypeSpecifications = new com.amazonaws.internal.SdkInternalList<InstanceTypeSpecification>();
          }
          return instanceTypeSpecifications;
      }
docs: <p>
  The specification for the instance types that comprise an instance fleet. Up to five unique instance
  specifications may be defined for each instance fleet.
  </p>
  
  @return The specification for the instance types that comprise an instance fleet. Up to five unique instance
  specifications may be defined for each instance fleet.