- Is a managed implementation of ElasticSearch, an open source search solution. It is part of the ELK stack (ElasticSearch, Logstash, Kibana)
- OpenSearch is not serverless, it runs in a VPC using compute
- OpenSearch is usually an alternative to other AWS services
- Can be used for log analytics, monitoring, security analytics, full text search and indexing, click stream analytics
ELK Stack
- ElasticSearch (or OpenSearch on AWS): provides search and indexing services
- Kibana: visualization and dashboard tool
- Logstash: similar to CloudWatch Logs, needs a Logstash agent installed on anything to ingest data