Benjamin Trent 8c581c3388
[ML] fixing and unmuting testHRDSplit test (#55349) (#55393)
This fixes the long muted testHRDSplit. Some minor adjustments for modern day elasticsearch changes :). 

The cause of the failure is that a new `by` field entering the model with an exceptionally high count does not cause an anomaly. We have since stopped combining the `rare` and `by` in this manner. New entries in a `by` field are not anomalous because we have no history on them yet. 

closes https://github.com/elastic/elasticsearch/issues/32966
2020-04-17 09:55:52 -04:00
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