@Override
  protected short computeCompressedShort(short s) {
    s = super.computeCompressedShort(s);
    if (estimate) {
      s |= ESTIMATE;
    }
    return s;
  }
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