docs: public GetContextKeysForPrincipalPolicyResult withContextKeyNames(String... contextKeyNames) {
          if (this.contextKeyNames == null) {
              setContextKeyNames(new com.amazonaws.internal.SdkInternalList<String>(contextKeyNames.length));
          }
          for (String ele : contextKeyNames) {
              this.contextKeyNames.add(ele);
          }
          return this;
      }