pluknet

Any specific reasons to enable accept_mutex and multi_accept? Note also, that they may not have any effect, see the relevant documentation: http://nginx.org/r/accept_mutex http://nginx.org/r/multi_accept You may need to explore how connections...

OpenSearch/Elasticsearch supports the legacy format, so this is not an issue. The main reason to use it in nginx is to keep things simple.

Unfortunately, there's little useful information provided on the link. Capturing backtrace and debug log preceding crashes, and providing minimal configuration to reproduce would be useful to figure out the reason...