docs: public CreateAssociationBatchResult withFailed(FailedCreateAssociation... failed) {
          if (this.failed == null) {
              setFailed(new com.amazonaws.internal.SdkInternalList<FailedCreateAssociation>(failed.length));
          }
          for (FailedCreateAssociation ele : failed) {
              this.failed.add(ele);
          }
          return this;
      }