Live data still persists after rollup

Elastic Stack Kibana
1

I am rolling creating a rollup index with a 7d delay. The live index I am rolling up from has been around for months. The job has been running fine, but as the rolledup index is written to, I am expecting data that is older than 7 days in the original index to "disappear". Am I incorrect in that assumption?

We are also using ILM to delete old data, but this is set at 60 days.

2

Rollups shouldn't delete data, as it's meant as a non-destructive process. So the ILM is the only thing used to delete data.

3

Thank you. Has this policy changed in the recent past, like last year or so?