@Override
  public CompletableFuture<Short> updateBlobExpirationAsync(BlobId blobId, long expirationTime,
      CloudUpdateValidator cloudUpdateValidator) {
    throw new UnsupportedOperationException("updateBlobExpirationAsync will not be implemented for AzureCloudDestinationSync");
  }
Returns true if a blob exists in Azure storage, false otherwise.
@param blobId
@return
ambry-cloud/src/main/java/com/github/ambry/cloud/azure/AzureCloudDestinationSync.java