@Override
    protected void updateStatistics() {
      stats.setNonReplicatedTombstonesSize(getMemoryEstimate());
    }
For test purposes only, force the expiration of a number of tombstones for replicated regions.

@param count Number of tombstones to expire
@param timeout the maximum time to wait
@param unit the time unit of the {@code timeout} argument

@return true if the expiration occurred
geode-core/src/main/java/org/apache/geode/internal/cache/TombstoneService.java