[ML] add auditor to data frame plugin (#40012) #40394
Merged
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This adds a DataFrameAuditor, a index for audit messages, and an audit messages class.
I took the basic functionality found in the ML Auditor, and created two new abstract classes in
org.elasticsearch.xpack.core.common.notifications for consolidating what would be commonalities between any plugin using an Auditor-like system.
I opted to simply copy the Level class found in the ml notifications package. I thought it best do any refactoring for ML in a different PR.
As for what to audit and when, that question is still up in the air, but at least after this PR that functionality will be available.