@Override
  protected void setBooleans(short s, DataInput in,
      DeserializationContext context) throws ClassNotFoundException, IOException {
    super.setBooleans(s, in, context);
    estimate = ((s & ESTIMATE) != 0);
  }
This message may be sent to nodes before the PartitionedRegion is completely initialized due to
the RegionAdvisor(s) knowing about the existence of a partitioned region at a very early part
of the initialization
geode-core/src/main/java/org/apache/geode/internal/cache/partitioned/SizeMessage.java