# Tried "mutate" convert", logstash getting error from elasticsearch: "type \[float\] to \[long\]"
**URL:** https://discuss.elastic.co/t/tried-mutate-convert-logstash-getting-error-from-elasticsearch-type-float-to-long/292356
**Category:** Elasticsearch
**Created:** [December 17, 2021, 6:17pm UTC](https://discuss.elastic.co/t/tried-mutate-convert-logstash-getting-error-from-elasticsearch-type-float-to-long/292356 "2021-12-17T18:17:38Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@4art4](https://discuss.elastic.co/u/4art4)
#### Post date: [December 17, 2021, 6:17pm UTC](https://discuss.elastic.co/t/tried-mutate-convert-logstash-getting-error-from-elasticsearch-type-float-to-long/292356/1 "2021-12-17T18:17:38Z")
My expectation is that adding the 'convert' would insure that all data for that field will be of type "float", but I guess I did it wrong?
relevant part of data:
```auto
"metrics"=>[
{
"Unit"=>"Count",
"MetricName"=>"ResourceCount",
"Timestamp"=>"2021-11-22T15:31:50.684999",
"Value"=>2
},
{
"Unit"=>"Seconds",
"MetricName"=>"ResourceTime",
"Timestamp"=>"2021-11-22T15:31:50.685014",
"Value"=>0.4867427349090576e0
},
{
"Unit"=>"Count",
"MetricName"=>"PolicyException",
"Timestamp"=>"2021-11-22T15:31:51.170848",
"Value"=>1
}
],
```
mutate:
```auto
mutate {
convert => {
"[cc-data][metrics][Value]" => "float"
}
remove_field => ["message", "@timestamp", "@version", "host"]
}
```
but got error:
```auto
Could not index event to Elasticsearch. {:status=>400,
...
"status"=>400, "error"=>{"type"=>"illegal_argument_exception", "reason"=>"mapper [cc-data.metrics.Value] cannot be changed from type [float] to [long]"}}}}
```
---
### Author:  [@aaron-nimocks](https://discuss.elastic.co/u/aaron-nimocks)
#### Post date: [December 17, 2021, 6:24pm UTC](https://discuss.elastic.co/t/tried-mutate-convert-logstash-getting-error-from-elasticsearch-type-float-to-long/292356/2 "2021-12-17T18:24:19Z")
This has to be done in the [index mapping](https://www.elastic.co/guide/en/elasticsearch/reference/current/mapping.html). The data types in Logstash don't translate over to Elastic and are only used internally to Logstash.
---
### Author:  [@4art4](https://discuss.elastic.co/u/4art4)
#### Post date: [December 17, 2021, 6:25pm UTC](https://discuss.elastic.co/t/tried-mutate-convert-logstash-getting-error-from-elasticsearch-type-float-to-long/292356/3 "2021-12-17T18:25:32Z")
Thank you so much for your help!
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [January 14, 2022, 6:26pm UTC](https://discuss.elastic.co/t/tried-mutate-convert-logstash-getting-error-from-elasticsearch-type-float-to-long/292356/4 "2022-01-14T18:26:02Z")
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