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[8.17] Update keyword documentation for logsdb (#126652) #126662

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Apr 11, 2025
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[8.17] Update keyword documentation for logsdb (#126652) #126662

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5 changes: 3 additions & 2 deletions docs/reference/data-streams/logs.asciidoc
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Expand Up @@ -170,8 +170,9 @@ can be indexed without causing ingestion failures.
==== `ignore_above`

In `logsdb` index mode, the `index.mapping.ignore_above` setting is applied by default at the index level to ensure
efficient storage and indexing of large keyword fields.The index-level default for `ignore_above` is 8191
_characters._ Using UTF-8 encoding, this results in a limit of 32764 bytes, depending on character encoding.
efficient storage and indexing of large keyword fields. This applies to all members of the keyword type family (keyword,
constant_keyword, and wildcard). The index-level default for `ignore_above` is 8191 _characters._ Using UTF-8 encoding,
this results in a limit of 32764 bytes, depending on character encoding.

The mapping-level `ignore_above` setting takes precedence. If a specific field has an `ignore_above` value
defined in its mapping, that value overrides the index-level `index.mapping.ignore_above` value. This default
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7 changes: 4 additions & 3 deletions docs/reference/mapping/types/keyword.asciidoc
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Expand Up @@ -74,9 +74,10 @@ The following parameters are accepted by `keyword` fields:
<<ignore-above,`ignore_above`>>::

Do not index any string longer than this value. Defaults to `2147483647`
so that all values would be accepted. Please however note that default
dynamic mapping rules create a sub `keyword` field that overrides this
default by setting `ignore_above: 256`.
in standard indices so that all values would be accepted, and `8191` in logsdb
indices to protect against Lucene's term byte-length limit of `32766`. Please
however note that default dynamic mapping rules create a sub `keyword` field
that overrides this default by setting `ignore_above: 256`.

<<mapping-index,`index`>>::

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3 changes: 2 additions & 1 deletion docs/reference/mapping/types/wildcard.asciidoc
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Expand Up @@ -123,7 +123,8 @@ The following parameters are accepted by `wildcard` fields:
<<ignore-above,`ignore_above`>>::

Do not index any string longer than this value. Defaults to `2147483647`
so that all values would be accepted.
in standard indices so that all values would be accepted, and `8191` in
logsdb indices to protect against Lucene's term byte-length limit of `32766`.

[discrete]
==== Limitations
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