Benjamin Trent 4396a1f78b
[ML][Inference] fix support for nested fields (#50258) (#50335)
This fixes support for nested fields

We now support fully nested, fully collapsed, or a mix of both on inference docs.

ES mappings allow the `_source` to be any combination of nested objects + dot delimited fields.
So, we should do our best to find the best path down the Map for the desired field.
2019-12-18 15:47:06 -05:00
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