Versions (relevant - OpenSearch/Dashboard/Server OS/Browser): AWS Opensearch 2.7
Describe the issue:
Recently, we’re migrating ElasticSearch 7.3.10 self-hosted on EC2 to AWS OpenSearch 2.7 and meet some performance issue.
For example: During the peak hour, our ElasticSearch can index the data ~5000 request/s, but with OpenSearch there is just arround ~1000 request/s
ElaticSearch is running in 2 regions, each region has 3 c5.2xlarge nodes
Opensearch is running in the same 2 regions, each region has 3 c5.2xlarge.search data nodes with cross-cluster replication
They are using the same EBS volume configuration with default gp3 500GB
They are using the same index, same size, refresh_interval is 60s with 1 primary and 2 replicas per cluster.
Is there any difference between ElasticSearch & OpenSearch which causing the performance issue with the same instance type. And please help to advice what I can do to optimize the OpenSearch cluster?