Opensearch 2.13 performance worst then elasticsearch 7.4

OpenSearch
1

Versions (relevant - OpenSearch/Dashboard/Server OS/Browser):
Old version - elastic search 7.4
New version - opensearch 2.13

Describe the issue:
I migrated from in AWS elasticsearch 7.4 to AWS opensearch v2.13 and found out the latency worst compare to 7.4

The average search latency for 7.4 was under 50ms but for new opensearch v2.13, the latency hover between 150-160 ms.

Configuration:
Setup the same mappings, settings, data nodes, and sharding for the new opensearch 2.13

Based on this article, we seem getting the same average search latency that not perform better than v7.4…

Anyone experience this issue? and how do you solve it?

2

@kitkit Can you try with opensearch 2.16 which is the latest version, I did a benchmark on opensearch 2.16 and elastic search 7.4.2, and I see in almost all different task types, opensearch 2.16 has better performance than elasticsearch 7.4.2. Also can you double confirm that your elastic search and opensearch cluster have same configuration?