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Update format docs for the correct week-date locale source #113781

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Update format docs for the correct week-date locale source #113781

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83844d2
Use the correct locale definition
thecoop Sep 30, 2024
ac5008f
Update reference to ISO
thecoop Sep 30, 2024
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9 changes: 4 additions & 5 deletions docs/reference/mapping/params/format.asciidoc
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Expand Up @@ -54,8 +54,7 @@ which are not affected by locale information.
There can also be differences in week-date calculations using the `Y`, `W`, and `w` field specifiers.
The underlying data used to calculate week-dates can vary depending on the JDK version and locale;
this can cause differences in the calculated week-date for the same calendar dates.
It is recommended that the built-in week-date formats are used, which will always use ISO rules
for calculating week-dates.
It is recommended that the built-in week-date formats that use ISO week-date definitions are used.

In particular, there is a significant change in locale information between JDK releases 22 and 23.
Elasticsearch will use the _COMPAT_ locale database when run on JDK 22 and before,
Expand Down Expand Up @@ -304,19 +303,19 @@ The following tables lists all the defaults ISO formats supported:
`weekyear` or `strict_weekyear`::

A formatter for a four digit weekyear: `YYYY`.
This uses the ISO week-date definition.
This uses the locale week-date definition.

`weekyear_week` or `strict_weekyear_week`::

A formatter for a four digit weekyear and two digit week of weekyear:
`YYYY-'W'ww`.
This uses the ISO week-date definition.
This uses the locale week-date definition.

`weekyear_week_day` or `strict_weekyear_week_day`::

A formatter for a four digit weekyear, two digit week of weekyear, and one
digit day of week: `YYYY-'W'ww-e`.
This uses the ISO week-date definition.
This uses the locale week-date definition.

`year` or `strict_year`::

Expand Down