docs: public void setClusterSubnetGroups(java.util.Collection<ClusterSubnetGroup> clusterSubnetGroups) {
          if (clusterSubnetGroups == null) {
              this.clusterSubnetGroups = null;
              return;
          }
  
          this.clusterSubnetGroups = new com.amazonaws.internal.SdkInternalList<ClusterSubnetGroup>(clusterSubnetGroups);
      }