def batch!(operations, request_options = {})
      res = batch(operations, request_options)
      res['taskID'].each do |index, taskID|
        wait_task(index, taskID, WAIT_TASK_DEFAULT_TIME_BEFORE_RETRY, request_options)
      end
    end
def batch!(operations, request_options = {})
      res = batch(operations, request_options)
      res['taskID'].each do |index, taskID|
        wait_task(index, taskID, WAIT_TASK_DEFAULT_TIME_BEFORE_RETRY, request_options)
      end
    end
Send a batch request targeting multiple indices and wait the end of the indexing