# How to use mutate in elasticsearch Input plugin?
**URL:** https://discuss.elastic.co/t/how-to-use-mutate-in-elasticsearch-input-plugin/51046
**Category:** Logstash
**Created:** [May 26, 2016, 10:46am UTC](https://discuss.elastic.co/t/how-to-use-mutate-in-elasticsearch-input-plugin/51046 "2016-05-26T10:46:12Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@vikas\_gopal](https://discuss.elastic.co/u/vikas_gopal)
#### Post date: [May 26, 2016, 10:46am UTC](https://discuss.elastic.co/t/how-to-use-mutate-in-elasticsearch-input-plugin/51046/1 "2016-05-26T10:46:12Z")
Hi Experts ,
Requirement :- Remove fields from an existing Index.
I am using LS to reindex my data . I am using
```
input {
elasticsearch {
hosts => ["localhost"]
port => "9200"
index => "cef-2016-04-01"
scroll => "20m"
}
}
output {
elasticsearch {
host => "localhost"
protocol => "http"
index => "cefoneshard"
}
stdout {
codec => "dots"
}
}
```
Above is working absolutely fine but I want to delete Message field from OLD index . By this I mean new index should not have message field in it . I was curious to know if this is possible with above LS config file .Something like Mutate. If not please help me to achieve this .
Thanks
VG
---
### Author:  [@warkolm](https://discuss.elastic.co/u/warkolm)
#### Post date: [May 26, 2016, 9:46pm UTC](https://discuss.elastic.co/t/how-to-use-mutate-in-elasticsearch-input-plugin/51046/2 "2016-05-26T21:46:36Z")
Mutate should definitely be able to do it.
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 6, 2017, 4:55am UTC](https://discuss.elastic.co/t/how-to-use-mutate-in-elasticsearch-input-plugin/51046/3 "2017-07-06T04:55:59Z")