Logstash 429 errors

I have logstash 2.2.2 installed in my server. I see following 429 warnings in the logstashlogs. what do these logs mean? Does it mean the retry succeeds, or the event is going to be retried?
Also are there any tips to walk around the 429(too many requests) response?

{:timestamp=>"2016-03-14T21:48:06.924000-0400", :message=>"Got a 429 response: {"retry_after":1,"ok":false,"error":"rate_limited"}", :level=>:warn}
{:timestamp=>"2016-03-14T21:48:19.647000-0400", :message=>"Got a 429 response: {"retry_after":1,"ok":false,"error":"rate_limited"}", :level=>:warn}
{:timestamp=>"2016-03-14T21:50:16.987000-0400", :message=>"Got a 429 response: {"retry_after":1,"ok":false,"error":"rate_limited"}", :level=>:warn}
{:timestamp=>"2016-03-14T21:52:09.596000-0400", :message=>"Got a 429 response: {"retry_after":1,"ok":false,"error":"rate_limited"}", :level=>:warn}
{:timestamp=>"2016-03-14T21:53:54.587000-0400", :message=>"Got a 429 response: {"retry_after":1,"ok":false,"error":"rate_limited"}", :level=>:warn}
{:timestamp=>"2016-03-14T22:00:09.295000-0400", :message=>"Got a 429 response: {"retry_after":1,"ok":false,"error":"rate_limited"}", :level=>:warn}
{:timestamp=>"2016-03-14T22:00:24.223000-0400", :message=>"Got a 429 response: {"retry_after":1,"ok":false,"error":"rate_limited"}", :level=>:warn}
{:timestamp=>"2016-03-14T22:02:59.302000-0400", :message=>"Got a 429 response: {"retry_after":1,"ok":false,"error":"rate_limited"}", :level=>:warn}
{:timestamp=>"2016-03-14T22:03:22.004000-0400", :message=>"Got a 429 response: {"retry_after":1,"ok":false,"error":"rate_limited"}", :level=>:warn}
{:timestamp=>"2016-03-14T22:15:01.979000-0400", :message=>"Got a 429 response: {"retry_after":1,"ok":false,"error":"rate_limited"}", :level=>:warn}

429 means your ES cluster cannot keep up, so you should look at what is happening there using something like Marvel.

What does the logs mean? The event is retried or is going to be retired?

https://www.elastic.co/guide/en/logstash/current/plugins-outputs-elasticsearch.html#_retry_policy

If you are on the latest, it'll retry infinitely.

Thank you for your answer.