# Logstash.filters.mutate

**URL:** <https://discuss.elastic.co/t/logstash-filters-mutate/301241>\
**Category:** Logstash\
**Created:** [March 31, 2022, 5:57pm UTC](https://discuss.elastic.co/t/logstash-filters-mutate/301241 "2022-03-31T17:57:51Z")\
**Posts on this page:** 8\
**Page:** 1

<div class="post-metadata">

**Author:** ![INS](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ins/32/92827_2.png) [@INS](https://discuss.elastic.co/u/INS)\
**Post date:** [March 31, 2022, 5:57pm UTC](https://discuss.elastic.co/t/logstash-filters-mutate/301241/1 "2022-03-31T17:57:51Z")

</div>

Hi  
I'm facing the problem with filters.mutate

`[2022-03-31T17:49:26,980][WARN][logstash.filters.mutate][subscriberstrunk][11ac345049d68c6fc55061d82c036ef3c26cf4e2fe68230c4df255bc3403de66] Exception caught while applying mutate filter {:exception=>"Invalid FieldReference: `%{[data][1]}`"}`

I'm using below code

```auto
  mutate {
    split => ["data", "::"]
    add_field => {"tmp" => "%{[data][1]}" }
  }

```

What's wrong?

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<div class="post-metadata">

**Author:** ![leandrojmp](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/leandrojmp/32/107231_2.png) [@leandrojmp](https://discuss.elastic.co/u/leandrojmp)\
**Post date:** [March 31, 2022, 6:29pm UTC](https://discuss.elastic.co/t/logstash-filters-mutate/301241/2 "2022-03-31T18:29:24Z")

</div>

Hello,

Please share an example of your message so people can try to reproduce what you are doing.

---

<div class="post-metadata">

**Author:** ![INS](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ins/32/92827_2.png) [@INS](https://discuss.elastic.co/u/INS)\
**Post date:** [March 31, 2022, 7:07pm UTC](https://discuss.elastic.co/t/logstash-filters-mutate/301241/3 "2022-03-31T19:07:15Z")

</div>

Hi sure this is sample date :

```auto
dn: uid=8626270,ou=subscriberstrunkmembers,ou=subscriberstrunk,ou=sdr,o=ool
uid: 8626270
serviceId: T10065990

dn: uid=T10065903,ou=subscriberstrunk,ou=sdr,o=ool.com.pl
uid: T10065903
serviceId: T10065903
brand: 11

dn: uid=T10065914,ou=subscriberstrunk,ou=sdr,o=ool.com.pl
uid: T10065914
serviceId: T10065914
brand: 11

dn: uid=847537,ou=subscriberstrunk,ou=sdr,o=ool.com.pl
uid: 847537
serviceId: 847537
brand: 11

dn: uid=847538,ou=subscriberstrunk,ou=sdr,o=ool.com.pl
uid: 847538
serviceId: 847538
brand: 11

dn: uid=847536,ou=subscriberstrunk,ou=sdr,o=ool.com.pl
uid: 847536
serviceId: 8475

```

---

<div class="post-metadata">

**Author:** ![leandrojmp](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/leandrojmp/32/107231_2.png) [@leandrojmp](https://discuss.elastic.co/u/leandrojmp)\
**Post date:** [March 31, 2022, 8:48pm UTC](https://discuss.elastic.co/t/logstash-filters-mutate/301241/4 "2022-03-31T20:48:54Z")

</div>

You need to provide more information.

Please share your **full** pipeline, it is not possible to understand what is happening without context.

Your mutate error means that logstash is trying to access the `data` field as it is an array, and get the second element, but this second element does not exist, which could mean that the `data` field is not an array.

But you need to share your full pipeline to show how you are creating this `data` field.

---

<div class="post-metadata">

**Author:** ![Badger](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/badger/32/25190_2.png) [@Badger](https://discuss.elastic.co/u/Badger)\
**Post date:** [March 31, 2022, 10:24pm UTC](https://discuss.elastic.co/t/logstash-filters-mutate/301241/5 "2022-03-31T22:24:53Z")

</div>

Also, which version of logstash?

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<div class="post-metadata">

**Author:** ![INS](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ins/32/92827_2.png) [@INS](https://discuss.elastic.co/u/INS)\
**Post date:** [April 1, 2022, 7:13am UTC](https://discuss.elastic.co/t/logstash-filters-mutate/301241/6 "2022-04-01T07:13:48Z")

</div>

this was build on for old version of logstash 7.2.0

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<div class="post-metadata">

**Author:** ![INS](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ins/32/92827_2.png) [@INS](https://discuss.elastic.co/u/INS)\
**Post date:** [April 1, 2022, 7:17am UTC](https://discuss.elastic.co/t/logstash-filters-mutate/301241/7 "2022-04-01T07:17:34Z")

</div>

and link to [pipeline](https://easyupload.io/8g9r3c)

---

<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:** [April 29, 2022, 7:17am UTC](https://discuss.elastic.co/t/logstash-filters-mutate/301241/8 "2022-04-29T07:17:53Z")

</div>

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