docs: protected void taskStart(int taskId, int rebalanceAsyncId) {
          taskCompletionTimeMs = System.currentTimeMillis();
          taskLog("[TaskId : " + taskId + " ] Starting rebalance of " + partitionStoreCount
                  + " partition-stores for async operation id " + rebalanceAsyncId + ".");
          progressBar.beginTask(taskId);
      }