public com.google.protobuf.ByteString getDesiredNodePoolIdBytes() {
    java.lang.Object ref = desiredNodePoolId_;
    if (ref instanceof java.lang.String) {
      com.google.protobuf.ByteString b =
          com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
      desiredNodePoolId_ = b;
      return b;
    } else {
      return (com.google.protobuf.ByteString) ref;
    }
  }
public com . google . protobuf . ByteString getDesiredNodePoolIdBytes ( ) { java . lang . Object ref = desiredNodePoolId_ ; if ( ref instanceof java . lang . String ) { com . google . protobuf . ByteString b = com . google . protobuf . ByteString . copyFromUtf8 ( ( java . lang . String ) ref ) ; desiredNodePoolId_ = b ; return b ; } else { return ( com . google . protobuf . ByteString ) ref ; } }
<pre>
The node pool to be upgraded. This field is mandatory if
"desired_node_version", "desired_image_family" or
"desired_node_pool_autoscaling" is specified and there is more than one
node pool on the cluster.
</pre>

<code>string desired_node_pool_id = 7;</code>