[7.x][ML] Add optional source filtering during data frame reindexing … #49718
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…(#49690)
This adds a
_source
setting under thesource
setting of a dataframe analytics config. The new
_source
is reusing the structureof a
FetchSourceContext
likeanalyzed_fields
does. Specifyingincludes and excludes for source allows selecting which fields
will get reindexed and will be available in the destination index.
Closes #49531
Backport of #49690