# Setting "dead\_letter\_queue.enable" hasn't been registered

**URL:** <https://discuss.elastic.co/t/setting-dead-letter-queue-enable-hasnt-been-registered/94934>\
**Category:** Logstash\
**Created:** [July 28, 2017, 10:22am UTC](https://discuss.elastic.co/t/setting-dead-letter-queue-enable-hasnt-been-registered/94934 "2017-07-28T10:22:12Z")\
**Posts on this page:** 6\
**Page:** 1

<div class="post-metadata">

**Author:** ![mitabrev](https://avatars.discourse-cdn.com/v4/letter/m/a88e57/32.png) [@mitabrev](https://discuss.elastic.co/u/mitabrev)\
**Post date:** [July 28, 2017, 10:22am UTC](https://discuss.elastic.co/t/setting-dead-letter-queue-enable-hasnt-been-registered/94934/1 "2017-07-28T10:22:12Z")

</div>

I'm reading a little the docs, want to optimize my indexing and I think the setting `dead_letter_queue.enable`: true would be useful.

So I added this line to my logstash.yml, started the service but got the error:

```
`[2017-07-28T12:10:01,874][FATAL][logstash.runner] An unexpected error occurred! {:error=>#<ArgumentError: Setting "dead_letter_queue.enable" hasn't been registered>, :backtrace=>["/usr/share/logstash/logstash-core/lib/logstash/settings.rb:29:in `get_setting'", "/usr/share/logstash/logstash-core/lib/logstash/settings.rb:61:in `set_value'", "/usr/share/logstash/logstash-core/lib/logstash/settings.rb:80:in `merge'", "org/jruby/RubyHash.java:1342:in `each'", "/usr/share/logstash/logstash-core/lib/logstash/settings.rb:80:in `merge'", "/usr/share/logstash/logstash-core/lib/logstash/settings.rb:129:in `validate_all'", "/usr/share/logstash/logstash-core/lib/logstash/runner.rb:217:in `execute'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/clamp-0.6.5/lib/clamp/command.rb:67:in `run'", "/usr/share/logstash/logstash-core/lib/logstash/runner.rb:185:in `run'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/clamp-0.6.5/lib/clamp/command.rb:132:in `run'", "/usr/share/logstash/lib/bootstrap/environment.rb:71:in `(root)'"]}`

```

Do you have any suggestions?

Thanks!  
M

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<div class="post-metadata">

**Author:** ![Christian\_Dahlqvist](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/christian_dahlqvist/32/4617_2.png) [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)\
**Post date:** [July 28, 2017, 10:41am UTC](https://discuss.elastic.co/t/setting-dead-letter-queue-enable-hasnt-been-registered/94934/2 "2017-07-28T10:41:36Z")

</div>

Which version of Logstash and the Elasticsearch output plugin are you using?

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<div class="post-metadata">

**Author:** ![mitabrev](https://avatars.discourse-cdn.com/v4/letter/m/a88e57/32.png) [@mitabrev](https://discuss.elastic.co/u/mitabrev)\
**Post date:** [July 28, 2017, 11:08am UTC](https://discuss.elastic.co/t/setting-dead-letter-queue-enable-hasnt-been-registered/94934/3 "2017-07-28T11:08:17Z")

</div>

5.4.0 both

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<div class="post-metadata">

**Author:** ![Christian\_Dahlqvist](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/christian_dahlqvist/32/4617_2.png) [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)\
**Post date:** [July 28, 2017, 11:09am UTC](https://discuss.elastic.co/t/setting-dead-letter-queue-enable-hasnt-been-registered/94934/4 "2017-07-28T11:09:27Z")

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The dead letter queue functionality was introduced in version 5.5.0, so you will need to upgrade to use it.

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<div class="post-metadata">

**Author:** ![mitabrev](https://avatars.discourse-cdn.com/v4/letter/m/a88e57/32.png) [@mitabrev](https://discuss.elastic.co/u/mitabrev)\
**Post date:** [July 28, 2017, 11:10am UTC](https://discuss.elastic.co/t/setting-dead-letter-queue-enable-hasnt-been-registered/94934/5 "2017-07-28T11:10:38Z")

</div>

ok, tnx for the info!

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [August 25, 2017, 11:10am UTC](https://discuss.elastic.co/t/setting-dead-letter-queue-enable-hasnt-been-registered/94934/6 "2017-08-25T11:10:38Z")

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Closed on August 25, 2017, 11:10am UTC

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