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Docs: Update highlighting.asciidoc 

Added note about how to highlight on the `_all` field

Closes #7991
This commit is contained in:
Clinton Gormley 2014-10-15 13:44:36 +02:00
parent fdbb62b1ab
commit 6a180d1803
1 changed files with 6 additions and 0 deletions
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6
docs/reference/search/request/highlighting.asciidoc
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@ -23,11 +23,17 @@ search hit (there will be another element in each search hit, called
`highlight`, which includes the highlighted fields and the highlighted
fragments).
[NOTE]
==================================
In order to perform highlighting, the actual content of the field is
required. If the field in question is stored (has `store` set to `true`
in the mapping) it will be used, otherwise, the actual `_source` will
be loaded and the relevant field will be extracted from it.
The `_all` field cannot be extracted from `_source`, so it can only
be used for highlighting if it mapped to have `store` set to `true`.
==================================
The field name supports wildcard notation. For example, using `comment_*`
will cause all fields that match the expression to be highlighted.