How to apply ILM to ML indices? If not possible what,s the workaround?

Elastic Stack Elasticsearch
1

Understand that ILM cannot be used on ML results indices. ILM is used on the ML state index out-of-the-box.

Seems like this is a long open enhancement.
[ML] Add an ML results index rollover endpoint · Issue #29946 · elastic/elasticsearch · GitHub

The size of each ML results index can be kept down by using a custom index per job instead of the shared results index.

Could anyone guide us with example on how we can do that?

2

See the API documentation: Create an anomaly detection job | Elasticsearch API documentation

See:

  • results_index_name
  • results_retention_days