Remove special characters in a filed value

Elastic Stack Logstash
1

In my logstash filter, I received following filed and its value.. In order to remove duplicate filed value, first I need to remove special characters in that filed value.

For given sample the field name "log_name" listed two results and they are duplicated values, but followed with special characters. "Authentication," and "Authentication;"

So Need a help to remove special characters in the filed value (, and ; ) -> comma and colon

"log_name" => [
    [0] "Authentication,",
    [1] "Authentication;"
],
2

Use a mutate filter and its gsub option to replace commas and colons with an empty string.

3

How you deleted duplicated data after removing special characters?