We have been using elastic 7.17
Our application has load tests and we generally measure the performance
After upgrading to elastic 8, we see lot of difference in the results we had when compared to elastic 7
We also noticed that if Elasticsearch is restarted, then the results are matching to the previous results of elastic 8
It is also noticed that it uses more heap memory compared to before version
Could you please provide us some insights why it is so
My experience from the past few years moving from ES5 -> 6 -> 7 and about to go to 8.
The performance has diminishes on each upgrade. The performance degradation is not huge. Something like 5 - 10%. We eventually get used to the new norm and scale accordingly.
I think it's the trade off between more feature vs efficiency.
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