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KNOWN_ISSUES.md

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Known issues

Cache deadlock

All elasticsearch versions between 5.5.3 (included) and 6.3.0 (excluded) are affected by a bug in the internal cache that may lead to a serious deadlock that could in theory leak all the search threads. A possible workaround is to configure the cache to avoid as much as possible its eviction mechanism by setting these options in your elasticsearch.yml file:

ltr.caches.expire_after_write: 0
ltr.caches.expire_after_read: 0
ltr.caches.max_mem: 100mb

elasticsearch versions 5.6.10, 6.3.0 and onwards should include the bugfix for this bug.