void updateLogSegmentDeletedBucket(Long bucketKey, LogSegmentName logSegmentName, long value) {
    if (bucketKey != null && logSegmentDeltaBucketsForDeleted.containsKey(bucketKey)) {
      Map<LogSegmentName, Long> existingBucketEntry = logSegmentDeltaBucketsForDeleted.get(bucketKey);
      updateMapHelper(existingBucketEntry, logSegmentName, value);
    }
  }
Helper function to update a log segment deleted bucket with a given value.
@param bucketKey the bucket key to specify which bucket will be updated
@param logSegmentName the log segment name of the map entry to be updated
@param value the value to be added
ambry-store/src/main/java/com/github/ambry/store/ScanResults.java