@Override
    protected void expireTombstone(Tombstone tombstone) {
      if (logger.isTraceEnabled(LogMarker.TOMBSTONE_VERBOSE)) {
        logger.trace(LogMarker.TOMBSTONE_VERBOSE, "removing expired tombstone {}", tombstone);
      }
      updateMemoryEstimate(-tombstone.getSize());
      tombstone.region.getRegionMap().removeTombstone(tombstone.entry, tombstone);
    }
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