So the solution is to delete the actual index name?
If you'd like to retain the collected data you can follow step 2 in the comment on how to recover from this issue. Once the cloning finished, you will indeed need to delete the conflicting
index and ensure the APM Server creates a new
Why does this problem occur?
It can for example occur if one manually deletes the indices after the APM Server took care of the setup. Another possibility is that they were manually setup in the first place and not properly linked with ILM.