Hi,
stumbled over this as well → Logstash-oss with non-removable x-pack - #2 by nean
I also addressed x_pack issues in OSS packages on the elastic’s logstash github → logstash-oss not starting and contain non-removable x-pack · Issue #10783 · elastic/logstash · GitHub
I had a look at the elastic docs and it appears ilm - “index lifecycle management API” is exclusively for x_pack, an elastic proprietary feature which shouldn’t actually cause issues in OSS versions.