def clear!(request_options = {})
      res = clear(request_options)
      wait_task(res['taskID'], WAIT_TASK_DEFAULT_TIME_BEFORE_RETRY, request_options)
      res
    end
def clear!(request_options = {})
      res = clear(request_options)
      wait_task(res['taskID'], WAIT_TASK_DEFAULT_TIME_BEFORE_RETRY, request_options)
      res
    end
Delete the index content and wait end of indexing