synchronized void decrementNoCopiesBucketCount() {
    if (noCopiesBuckets == 0) {
      return;
    }
    noCopiesBuckets--;
    stats.incNoCopiesBucketCount(-1);
    // if the last bucket with no copies has gained a copy, the bucket with the lowest
    // number of copies (that bucket) has one copy
    if (noCopiesBuckets == 0) {
      lowestBucketCopies = 1;
    }
  }
Decrements the count of buckets that no longer have any copies remaining
geode-core/src/main/java/org/apache/geode/internal/cache/PartitionedRegionRedundancyTracker.java