private void notifyIndex(boolean isUpdating) {
    if (getOwner().getIndexMaintenanceSynchronous()) {
      getRegionEntry().setUpdateInProgress(isUpdating);
    }
  }
@return false if caller should retry because entry is no longer in the map
geode-core/src/main/java/org/apache/geode/internal/cache/map/AbstractRegionMapPut.java