OpenSearch/docs/reference/mapping/params/index-phrases.asciidoc

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[[index-phrases]]
=== `index_phrases`
If enabled, two-term word combinations ('shingles') are indexed into a separate
field. This allows exact phrase queries (no slop) to run more efficiently, at the expense
of a larger index. Note that this works best when stopwords are not removed,
as phrases containing stopwords will not use the subsidiary field and will fall
back to a standard phrase query. Accepts `true` or `false` (default).