OpenSearch vs Elasticsearch: Which Search Engine?
OpenSearch is the Apache-2.0 fork of Elasticsearch led by AWS and the community; Elasticsearch is the original engine under Elastic licensing.
OpenSearch forked from Elasticsearch 7.10 after the license change, offering a fully open (Apache-2.0) search and analytics engine with its own dashboards and feature roadmap. Elasticsearch continues under Elastic with the SSPL/Elastic License (and again AGPL), shipping advanced features and tight commercial integration. OpenSearch wins on permissive licensing and AWS integration; Elasticsearch wins on the most advanced features and the original ecosystem.
| OpenSearch | Elasticsearch | |
|---|---|---|
| License | Apache-2.0 | Elastic / AGPL / SSPL |
| Origin | Fork of ES 7.10 | Original |
| Dashboards | OpenSearch Dashboards | Kibana |
| Cloud fit | AWS-native | Elastic Cloud |
| Best for | Open license, AWS | Latest features, original |
Use case and licensing
OpenSearch suits teams that need a fully permissive license or run on AWS-managed OpenSearch Service. Elasticsearch suits teams wanting the latest features, ML, and the original Elastic ecosystem and commercial support.
Ops and CI fit
The two have diverged over time but remain broadly similar to operate; client and API compatibility varies by version. Both are integration-tested in CI against ephemeral clusters, where faster managed runners speed image pulls and index tests.
The verdict
Need a permissive Apache-2.0 license or AWS-managed search: OpenSearch. Want the latest features and the original ecosystem: Elasticsearch. License and cloud strategy usually decide it.