Unable to strip IPv6 Address From Field

I am using the below filter but it isn't working. No errors being thrown, the string just isn't being stripped.

filter {
  if "::ffff:" in [event_data.IpAddress] {
    mutate {
      id => "IPv6 Strip"
      gsub => [
        "event_data.IpAddress", "::ffff:", ""

Looks like Logstash, not beats related. Anyways, nested fields must be accessed using index syntax in logstash. e.g. [event_data][IpAddress].

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