Can I delete a older system index once a rollover has been made?

So I got this index which got massive we were trying out the APM, now it has been made a rollover but the older one still have a huge impact on the cluster.

Already talked to the team and decided to delete the 100GB one but if we try the following message comes by:

Which leaded to the question, is it okay to delete it forcefully?

Yes you can delete that it is a backing index for the traces-apm-default data stream ...

The data will be gone (hopefully you have snapshots if you decided you needed it)

What you really probably want to do it adjust the APM lifecycle policy at some point to delete at some point / days etc.

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