# Is it possible to have Output Specific Filter or vice versa in Logstash

**URL:** <https://discuss.elastic.co/t/is-it-possible-to-have-output-specific-filter-or-vice-versa-in-logstash/246885>\
**Category:** Logstash\
**Created:** [August 30, 2020, 4:27pm UTC](https://discuss.elastic.co/t/is-it-possible-to-have-output-specific-filter-or-vice-versa-in-logstash/246885 "2020-08-30T16:27:39Z")\
**Posts on this page:** 6\
**Page:** 1

<div class="post-metadata">

**Author:** ![Dibyendu\_Dutta](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dibyendu_dutta/32/73594_2.png) [@Dibyendu\_Dutta](https://discuss.elastic.co/u/Dibyendu_Dutta)\
**Post date:** [August 30, 2020, 4:27pm UTC](https://discuss.elastic.co/t/is-it-possible-to-have-output-specific-filter-or-vice-versa-in-logstash/246885/1 "2020-08-30T16:27:40Z")

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I want to have a filter specific to Kafka output . Want to send messages with specific keywords only to Kafka. For ES output want to send all messages (no filter)

> ```
> output {
> 
> kafka {
> 
> bootstrap_servers => "localhost:9092"
> 
> topic_id =>'sample'
> codec => json
> }
> 
> elasticsearch {
> 
> hosts => "localhost:9200"
> 
> index =>"filebeat-%{+yyyy}"
> 
> }
> 
> }
> 
> ```

---

<div class="post-metadata">

**Author:** ![ylasri](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ylasri/32/86120_2.png) [@ylasri](https://discuss.elastic.co/u/ylasri)\
**Post date:** [August 30, 2020, 4:37pm UTC](https://discuss.elastic.co/t/is-it-possible-to-have-output-specific-filter-or-vice-versa-in-logstash/246885/2 "2020-08-30T16:37:45Z")

</div>

```
output {
if "system" in [tags] {
    kafka {
    bootstrap_servers => "localhost:9092"
    topic_id =>'sample'
    codec => json
    }
}
    elasticsearch {
    hosts => "localhost:9200"
    index =>"filebeat-%{+yyyy}"
    }
  }
```

---

<div class="post-metadata">

**Author:** ![Dibyendu\_Dutta](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dibyendu_dutta/32/73594_2.png) [@Dibyendu\_Dutta](https://discuss.elastic.co/u/Dibyendu_Dutta)\
**Post date:** [August 30, 2020, 5:48pm UTC](https://discuss.elastic.co/t/is-it-possible-to-have-output-specific-filter-or-vice-versa-in-logstash/246885/3 "2020-08-30T17:48:55Z")

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@ylasri Thanks for reply . I made one entry in `dmesg`

> echo "error hello world" \>\> /var/log/dmesg

And in Kafka

> if "error" in [tags] {  
> kafka {  
> }  
> }

It didn't work. is it [tags] or [messages]

---

<div class="post-metadata">

**Author:** ![ylasri](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ylasri/32/86120_2.png) [@ylasri](https://discuss.elastic.co/u/ylasri)\
**Post date:** [August 30, 2020, 5:53pm UTC](https://discuss.elastic.co/t/is-it-possible-to-have-output-specific-filter-or-vice-versa-in-logstash/246885/4 "2020-08-30T17:53:22Z")

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`if "error" in [tags] ` this was just an example to illustrate that you can filter events based on your own criteria before sending them to an output.

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<div class="post-metadata">

**Author:** ![Dibyendu\_Dutta](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dibyendu_dutta/32/73594_2.png) [@Dibyendu\_Dutta](https://discuss.elastic.co/u/Dibyendu_Dutta)\
**Post date:** [August 30, 2020, 6:20pm UTC](https://discuss.elastic.co/t/is-it-possible-to-have-output-specific-filter-or-vice-versa-in-logstash/246885/5 "2020-08-30T18:20:08Z")

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Got it @ylasri .

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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:** [September 27, 2020, 6:20pm UTC](https://discuss.elastic.co/t/is-it-possible-to-have-output-specific-filter-or-vice-versa-in-logstash/246885/6 "2020-09-27T18:20:08Z")

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