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That's what the transaction log is for.
@SortOfTested I'm sort of confused, not sure how translog plays into this.
I have ELK setup to record a REST app's requests via filebeats and logstash.
Each day LS will store ask the data it gets into a new index yyyy.mm.dd.
I see ELASTIC using more RAM each day.
But it also seems to take up the equivalent disk space though so I'm thinking it stores a copy on disk too?
Can I unload the one in RAM but keep the data? And reload it when needed?
I see in the link it says in a crash data would be lost but when I restart ELK, the data is still there so I'm think it's loading from disk when it starts. But if the a way to tell ELASTIC which ones to load/ not load?