public void dumpMap() {
    logger.info("dump of concurrent map of size {} for region {}", getEntryMap().size(),
        _getOwner());
    for (final Object o : getEntryMap().values()) {
      logger.info("dumpMap:" + o.toString());
    }
  }
Removing the existing indexed value requires the current value in the cache, that is the one
prior to applying the operation.

@param entry the RegionEntry that contains the value prior to applying the op
geode-core/src/main/java/org/apache/geode/internal/cache/AbstractRegionMap.java