[7.x][ML] Add runtime mappings to data frame analytics source config … #69284
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…(#69183)
Users can now specify runtime mappings as part of the source config
of a data frame analytics job. Those runtime mappings become part of
the mapping of the destination index. This ensures the fields are
accessible in the destination index even if the relevant data frame
analytics job gets deleted.
Closes #65056
Backport of #69183