What ES indexes are created/required by datahub and Is there any ILM policy set on these indexes. IF ILM policy is not set what should be the ILM policies for these indexex.

Hey! DataHub creates a lot of indices, and they need to be persistent, so no need to create ILM policies on them. However, for time based indices like the datahub_usage_event index (which indices all activities on the platform) does have an ilm set in the elasticsearch-setup-job. We are currently working on setting this up for our timeseries aspect indices as well