Document index.mapping.exclude_source_vectors for vector _source exclusion - #7647
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Document index.mapping.exclude_source_vectors for vector _source exclusion#7647ash9146 wants to merge 1 commit into
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…usion The "Exclude vector fields from _source" section only described the generic excludes mapping parameter, with a warning that reindex "might not actually contain the dense_vector field in the new index." elastic/elasticsearch#131907 introduced a dedicated index.mapping.exclude_source_vectors index setting (enabled by default for new indices as of 9.2), which supports automatic rehydration for reindex, update, update_by_query, and recovery - solving exactly the problem this page's existing warning describes. This adds a "Recommended" subsection for the new setting, and reframes the existing excludes-parameter guidance as an alternative that still carries the reindex caveat (since it doesn't support rehydration).
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Summary
The "Exclude vector fields from
_source" section inapproximate-knn-search.mdonly described pruning vector fields viathe generic
excludesmapping parameter, with a warning that reindex"might not actually contain the
dense_vectorfield in the new index."elastic/elasticsearch#131907 introduced a dedicated
index.mapping.exclude_source_vectorsindex setting, enabled bydefault for new indices as of 9.2, which supports automatic
rehydration for reindex, update, update_by_query, and recovery -
solving exactly the problem this page's existing warning describes.
This adds a "Recommended" subsection documenting the new setting, and
reframes the existing
excludes-parameter guidance as an alternativethat still carries the reindex caveat (since it doesn't support
rehydration).
References
exclude_source_vectorsby default for new indices elasticsearch#131907 (the implementing PR)exclude_source_vectors by default for new indices" entry, which
confirms the rehydration behavior and default-on-9.2 timing.