docs: public ListConfigurationSetsResult withConfigurationSets(String... configurationSets) {
          if (this.configurationSets == null) {
              setConfigurationSets(new java.util.ArrayList<String>(configurationSets.length));
          }
          for (String ele : configurationSets) {
              this.configurationSets.add(ele);
          }
          return this;
      }