def delete!(request_options = {})
      res = delete(request_options)
      wait_task(res['taskID'], WAIT_TASK_DEFAULT_TIME_BEFORE_RETRY, request_options)
      res
    end
def delete!(request_options = {})
      res = delete(request_options)
      wait_task(res['taskID'], WAIT_TASK_DEFAULT_TIME_BEFORE_RETRY, request_options)
      res
    end
Delete an index and wait until the deletion has been processed

 @param request_options contains extra parameters to send with your query

 return an hash of the form { "deletedAt" => "2013-01-18T15:33:13.556Z", "taskID" => "42" }