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Slow loggers can cause Log4j loggers to leak over time. When a new index is created, a new Log4j logger is associated with it. However, when an index is deleted, Log4j keeps an internal reference to its loggers that results in a memory leak #57228 (issue: #56171)
This issue is fixed in Elasticsearch 6.8.10 and 7.7.1.
Also see Breaking changes in 6.8.
- Java based - formats with 8 prefix - week based parsing and calculations are using JDK default calendar data provider which is Sunday,1. Sunday is considered first day of a week and it requires only 1 day in a week to for the first week of the year. It can be worked around by using locale which is based on ISO8601 rule (Monday,4) - for instance en-GB This issue is fixed in Elasticsearch 7.7 https://github.com/elastic/elasticsearch/pull/48209
- Upgrade to Lucene 7.7.3 #55897