This affects you if you use custom date formatters using textual or week-date field specifiers. Otherwise, you are not affected. Elasticsearch from v8.15.2 will log deprecation warnings, visible in Kibana, if you are using date format specifiers that might change on upgrading to JDK 23.Elasticsearch will continue to be shipped with JDK 22 for all remaining v7.17.x and v8.15.x … [Read more...] about Locale changes in Elasticsearch 8.16 and JDK 23