@Override
  public synchronized void decRefCount(EvictionList evictionList, InternalRegion region) {
    if (TXManagerImpl.decRefCount(this)) {
      if (isInUseByTransaction()) {
        setInUseByTransaction(false);
        if (!isDestroyedOrRemoved()) {
          appendToEvictionList(evictionList);
          if (region != null && region.isEntryExpiryPossible()) {
            region.addExpiryTaskIfAbsent(this);
          }
        }
      }
    }
  }
Any bits in "bitMask" that are 0 will be cleared.
geode-core/src/main/java/org/apache/geode/internal/cache/entries/AbstractRegionEntry.java