Can't use cache or definitions

[nrtc-genesis-nick]

We're attempting to use this plugin to process ipfix from a router that doesn't send the template/definitions file very often. In trying to work around this, we tried to manually set the definitions file but see:

2024-01-05 16:17:21 +0000 [warn]: parameter 'definitions' in <source>
  @type netflowipfix
  port 2056
  tag "our_dumb_router"
  definitions /etc/fluent/ipfix.yaml
</source> is not used.

Additionally, we then tried to set the cache_ttl and saw the same:

2024-01-05 16:17:21 +0000 [warn]: parameter 'cache_ttl' in <source>
  @type netflowipfix
  port 2056
  tag "our_dumb_router"
  cache_ttl 6000
</source> is not used.

Being able to enable either of these options would solve our problem, however, we have no idea why either will not be used. Let me know what I can provide to help figure this out

[nrtc-genesis-nick]

bump