Conversion of field from string to int64

I have some data that is being ingested via Logstash and then being passed to Kafka as an output. From Kafka the data is then being passed to InfluxDB.
I have a field which is ingested as a string, an example is as this "0.5.-109.116"
I need this field to be of int64 type instead of a string.
I see that I cannot convert this as needed via mutate/convert filter or change how it is stored on Kafka output.
What is the best way to convert this field type in Logstash?

And what would the desired integer representation of "0.5.-109.116" be?

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