Benjamin Trent 945e7ca01e
[ML] Periodically persist data-frame running statistics to internal index (#40650) (#40729)
* [ML] Add mappings, serialization, and hooks to persist stats

* Adding tests for transforms without tasks having stats persisted

* intermittent commit

* Adjusting usage stats to account for stored stats docs

* Adding tests for id expander

* Addressing PR comments

* removing unused import

* adding shard failures to the task response
2019-04-02 14:16:55 -05:00
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