Unknown setting 'capitalize' for mutate Error


running Logstash 6.2.2 and trying to use the capitalize mutation

if [LogLevel] {
  mutate {
     capitalize => [ "LogLevel" ]

Logstash fails to load its configuration reporting in the Log
[ERROR][logstash.filters.mutate ] Unknown setting 'capitalize' for mutate

This only applies to capitalize using lowercase or uppercase works just fine.
Am I missing something here or is this a bug in the mutation plugin?

Kind regards,

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