# Underscore preventing us from upgrading from 1.7.1 to 2.x
**URL:** https://discuss.elastic.co/t/underscore-preventing-us-from-upgrading-from-1-7-1-to-2-x/63634
**Category:** Logstash
**Created:** [October 21, 2016, 3:18pm UTC](https://discuss.elastic.co/t/underscore-preventing-us-from-upgrading-from-1-7-1-to-2-x/63634 "2016-10-21T15:18:36Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@genesis](https://discuss.elastic.co/u/genesis)
#### Post date: [October 21, 2016, 3:18pm UTC](https://discuss.elastic.co/t/underscore-preventing-us-from-upgrading-from-1-7-1-to-2-x/63634/1 "2016-10-21T15:18:36Z")
I have been trying to resolve this issue which is preventing me from upgrading from 1.7.1 to 2.x due to this error:
The \_uid, \_id, \_type, \_source, \_all, \_parent, \_field\_names, \_routing, \_index, \_size, \_timestamp, and \_ttl field names are reserved and can no longer be used in the document \_source., in type: logs.
At the ElasticOn NY couple of days ago, I worked with Chris Earle and he suggested to make these changes in logstash and re-indexed but those indices when ran through the migration tool still show the same errors.
Please help
filter {
ruby {
init =\> "
def remove\_dots hash
new = Hash.new
hash.each { |k,v|
if v.is\_a? Hash
v = remove\_dots(v)
end
new[k.gsub('.','\_')] = v
if v.is\_a? Array
v.each { |elem|
if elem.is\_a? Hash
elem = remove\_dots(elem)
```
end
key = k.gsub('.','_')
if key.starts_with?('_')
key = key[1..-1]
end
new[key] = elem
} unless v.nil?
end
} unless hash.nil?
return new
end
"
code => "
event.instance_variable_set(:@data,remove_dots(event.to_hash))
"
```
}
mutate {
```
rename => { "_uid" => "uid" }
rename => { "_action" => "action" }
rename => { "_caps" => "caps" }
rename => { "_cldee" => "cldee" }
rename => { "_ga" => "ga" }
rename => { "_mbox" => "mbox" }
rename => { "_partner" => "partner" }
rename => { "_rand" => "rand" }
rename => { "_rdr" => "rdr" }
rename => { "_sm_au_" => "sm_au_" }
rename => { "_suid" => "suid" }
rename => { "_task" => "task" }
```
}
}
output {
elasticsearch {
hosts =\> ["[xxxxxxxxxx.com](http://xxxxxxxxxx.com)" ]
index =\> "%{[@metadata][\_index]}"
document\_type =\> "%{[@metadata][\_type]}"
document\_id =\> "%{[@metadata][\_id]}"
}
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 6, 2017, 4:33am UTC](https://discuss.elastic.co/t/underscore-preventing-us-from-upgrading-from-1-7-1-to-2-x/63634/2 "2017-07-06T04:33:15Z")