# What does this error mean

**URL:** <https://discuss.elastic.co/t/what-does-this-error-mean/213971>\
**Category:** Logstash\
**Created:** [January 7, 2020, 4:02am UTC](https://discuss.elastic.co/t/what-does-this-error-mean/213971 "2020-01-07T04:02:16Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![volcano](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/volcano/32/46287_2.png) [@volcano](https://discuss.elastic.co/u/volcano)\
**Post date:** [January 7, 2020, 4:02am UTC](https://discuss.elastic.co/t/what-does-this-error-mean/213971/1 "2020-01-07T04:02:16Z")

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what does this logstash error mean

`"status"=>400, "error"=>{"type"=>"illegal_argument_exception", "reason"=>"Can't merge a non object mapping [batch-upload-usage.costcalculation.elapsed-time] with an object mapping [batch-upload-usage.costcalculation.elapsed-time]"}}}}`

this is my logstash filter

```
mutate {
       split => ["batch-upload-usage.costcalculation_4","="]
       add_field => {"batch-upload-usage.costcalculation.elapsed-time" =>"%{[batch-upload-usage.costcalculation_4][0]}"}
       add_field => {"batch-upload-usage.costcalculation.elapsed-time.value" =>"%{[batch-upload-usage.costcalculation_4][1]}"}
}

```

How to fix this ?

---

<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:** [February 4, 2020, 4:02am UTC](https://discuss.elastic.co/t/what-does-this-error-mean/213971/2 "2020-02-04T04:02:17Z")

</div>

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