Bin/logstash-plugin not found

I have deployed LogStash on kubernetes using this image (logstash:8.8.1) and now I would like to install some plugins.
I understand that I would need to use the 'logstash-plugin' tool, whis should be located in the bin directory. But in my case there is no logstash-plugin in the bin directory.
Is there another tool that I can use?

Which version are you using? Maybe OSS version doesn't include.
You can find the binary here.