docs: public CreateReplicationGroupRequest withPreferredCacheClusterAZs(String... preferredCacheClusterAZs) {
          if (this.preferredCacheClusterAZs == null) {
              setPreferredCacheClusterAZs(new com.amazonaws.internal.SdkInternalList<String>(preferredCacheClusterAZs.length));
          }
          for (String ele : preferredCacheClusterAZs) {
              this.preferredCacheClusterAZs.add(ele);
          }
          return this;
      }