Commits on Nov 1, 2019

1. [7.x][ML] Prevent fetching multi-field from source (elastic#48770) …

   Aggregatable mutli-fields are at the moment wrongly mapped
   as normal doc_value fields and thus they support fetching from
   source. However, they do not exist in the source. This results
   to failure to extract such fields.
   
   This commit fixes this bug. While a fix could be worked out
   on top of the existing code, it is evident the extraction logic
   has become difficult to understand and maintain. As we also
   want to deduplicate multi-fields for data frame analytics,
   it seemed appropriate to refactor the code to simplify and
   better handle the extraction of multi-fields.
   
   Relates elastic#48756
   
   Backport of elastic#48770

   

   dimitris-athanasiou committed Nov 1, 2019
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