Using the Split filter with a dynamic field

Elastic Stack Logstash
1

Question

Can you use the split filter with a dynamic field ("%{some_field}")?

Problem

The documentation doesn't say (Split filter) and the intuitive split { field => "%{test}" } doesn't seem to work. Test case below:

Test Case:

{"test":"bar","bar":[{"m":"hello"},{"m":"world"}]}

Logstash conf file:

input {
  stdin {
    codec => json
  }
}

filter {
  split {
    field => "%{test}"
  }
}

output {
  stdout { codec => rubydebug { metadata => true } }
}

Error when running: