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[ML] Add optional source filtering during data frame reindexing (#49690)

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This adds a `_source` setting under the `source` setting of a data
frame analytics config. The new `_source` is reusing the structure
of a `FetchSourceContext` like `analyzed_fields` does. Specifying
includes and excludes for source allows selecting which fields
will get reindexed and will be available in the destination index.

Closes #49531
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Dimitris Athanasiou 2019-11-29 14:20:31 +02:00 • committed by GitHub
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docs/java-rest/high-level/ml/put-data-frame-analytics.asciidoc
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@ -52,6 +52,7 @@ include-tagged::{doc-tests-file}[{api}-source-config]
<1> Constructing a new DataFrameAnalyticsSource
<2> The source index
<3> The query from which to gather the data. If query is not set, a `match_all` query is used by default.
<4> Source filtering to select which fields will exist in the destination index.
===== QueryConfig