In case an index.translog.durability is set to async and process is killed, but OS is up and running.
Will there be any data loss?
From what I understand, only in case of OS reboot/ power loss/ hardware issues, there will be a data loss.
Am I right?
If you change the translog durability setting to async yes you can have data loss in case of hardware issues but I'd guess that it can also happen in case of hard kill of the jvm..
Why do you want to change it? Speed?
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