public void addFPAs(List<FixedPartitionAttributesImpl> fpaList) {
    if (elderFPAs != null) {
      elderFPAs.addAll(fpaList);
    }
  }
This method sets the isDestroying flag to true, to indicate that the PartitionedRegion's
destruction responsibility is taken up by a node.
geode-core/src/main/java/org/apache/geode/internal/cache/PartitionRegionConfig.java