我可以在Logstash中使用mutate过滤器将某些字段转换为genjdbc输入的整数吗？

I am using genjdbc input plugin for Logstash to get data from a DB2 database. It works perfectly, I get in Kibana all the database columns as fields. The problem I have is that in Kibana all fields are string type, and I want the numeric fields to be integers. I have tried the following code, but the result is the same that if no filter clause exists.I am using genjdbc input plugin for Logstash to