void makeReadyForRecording() {
    if (bitSet == null) {
      bitSet = new BitSet(BIT_SET_WIDTH);
      bitSetVersion = version;
      bitSet.set(0);
    }
  }
initialize a holder that was cloned from another holder so it is ready for use in a live vector
geode-core/src/main/java/org/apache/geode/internal/cache/versions/RegionVersionHolder.java