Remove part of field name from json inputted fields

[sirmodok]

I have tried using the information posted here

Logstash mutate - rename field that occurs as an array

Hi, I'm trying to rename a field within an Elasticsearch type using the mutate filter. This particular field occurs within a zero-to-many array. Here is a mapping that closely resembles mine (the names have been changed to protect the innocent): "fieldRoot": { "properties": { "fieldCollection": { "properties": { "itemColor": { "index": "no", "type": "string" }, "itemDescription": { "index": "no", "type": "string" …

And I just end up with _rubyparse errors in my tags as well as some additional "cannot convert string to integer " errors in my logstash.log