private StorageClient getAzureStorageClient(BlobId blobId) {
    // TODO Find the storage account corresponding to blobId.
    return storageClientList.get(0);
  }
Finds the StorageClient corresponds to given blob id.
@param blobId {@link BlobId} of the blob to find its mapping {@link StorageClient}.
@return {@link StorageClient} corresponds to Azure storage account holding Ambry metadata blobs.
ambry-cloud/src/main/java/com/github/ambry/cloud/azure/ShardedStorageClient.java