@Override
 public void readFrom(StreamInput in) throws IOException {
   super.readFrom(in);
   int n = in.readVInt();
   snapshotIds = new SnapshotId[n];
   for (int i = 0; i < n; i++) {
     snapshotIds[i] = SnapshotId.readSnapshotId(in);
   }
 }
 @Override
 public void readFrom(StreamInput in) throws IOException {
   super.readFrom(in);
   requestName = in.readString();
   nodeId = in.readString();
 }
 @Override
 public void readFrom(StreamInput in) throws IOException {
   super.readFrom(in);
   request = new ClusterStatsRequest();
   request.readFrom(in);
 }
 @Override
 public void readFrom(StreamInput in) throws IOException {
   super.readFrom(in);
   shardId = ShardId.readShardId(in);
   unallocated = in.readBoolean();
 }