Http filter - undefined local variable or method `parameters_sprintfed'

I have a very simple pipeline using the following http filter, but I continue to get errors (see here: https://gist.github.com/defensivedepth/7b8d22aeec6dedac6438d8adeaed4b1d)

I have tried different sites, different settings, but always come back to this error.

Any ideas on what to check? Logstash 6.6.1

input {
file {
path => "/input*.json"
codec => json
}

}

filter {
http {
url => "https://site.com/%{identifier}"
}

}

output {
stdout {}
}

Ouch! The workaround is to lower the log.level to info.

This debug message needs to be fixed.

Wow. Yep.

That fixed it.

Thanks @Badger

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