ILM is failing to delete closed indices

Elastic Stack Elasticsearch
4

Yes it matters. Closed indices remove can cause issue. Here are some similar discussions:

  1. Elasticsearch ILM failed delete closed indices
  2. Index Lifecycle Management - closing indices

If you send close index request via application, It'd be better to remove or open the index via application again.

But the main question is "why you need to close indices?" like @Aaron mentioned in here.