# Add field with logstash in csv file
**URL:** https://discuss.elastic.co/t/add-field-with-logstash-in-csv-file/84919
**Category:** Logstash
**Created:** [May 8, 2017, 10:54am UTC](https://discuss.elastic.co/t/add-field-with-logstash-in-csv-file/84919 "2017-05-08T10:54:50Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@zegdene](https://discuss.elastic.co/u/zegdene)
#### Post date: [May 8, 2017, 10:54am UTC](https://discuss.elastic.co/t/add-field-with-logstash-in-csv-file/84919/1 "2017-05-08T10:54:50Z")
Hi,
I create a file config.conf to insert data.csv in elasticsearch
i need to remove filed and add in empty filed
this is my config.conf:
```
input {
file {
path => "/home/salma/Documents/data.csv"
start_position => "beginning"
sincedb_path => "/dev/null"
}
}
filter {
csv {
separator => ","
#Date,Open,High,Low,Close,Volume (BTC),Volume (Currency),Weighted Price
columns => ["Open","High","Low","Close","Volume (BTC)", "Volume (Currency)" ,"Weighted Price"]
}
mutate {
add_field => { "foo_%{pred}"}
}
}
output {
elasticsearch {
hosts => "http://localhost:9200"
index => "bitcoin-prices"
}
stdout {}
}
```
but nothing change in elastcsearch
can help please
thank you!
---
### Author:  [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)
#### Post date: [May 8, 2017, 12:08pm UTC](https://discuss.elastic.co/t/add-field-with-logstash-in-csv-file/84919/2 "2017-05-08T12:08:08Z")
> ```
> add_field => { "foo_%{pred}"}
>
> ```
`add_field` needs two things: the name of the new field and its desired value. It should look like this:
```plaintext
add_field => {
"field name" => "field value"
}
```
Secondly, `%{pred}` doesn't make sense since your events don't have a field named `pred`.
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [June 5, 2017, 12:21pm UTC](https://discuss.elastic.co/t/add-field-with-logstash-in-csv-file/84919/3 "2017-06-05T12:21:25Z")
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