4+ Elasticsearch-Compatible Databases Ranked & Compared

OpenSearch is a fork of Elasticsearch 7.10 created by Amazon in 2021 after Elastic changed Elasticsearch's license from Apache 2.0 to a dual-license (SSPL and Elastic License). OpenSearch is fully open-source under Apache 2.0 and is now developed independently by AWS, SAP, and other contributors. The two share API compatibility for most operations — Kibana dashboards, REST queries, ingestion pipelines work on both. Elasticsearch has continued evolving with new features (semantic search, agent integrations) that OpenSearch doesn't have yet.

For most use cases, yes — at least for Elasticsearch 7.x APIs. OpenSearch maintains compatibility with Elasticsearch 7.10's REST API, so existing clients, Logstash configurations, Beats, and most application code work unchanged. OpenSearch also has its own Dashboards (a Kibana fork). The two have diverged since 2021: Elasticsearch 8.x added features OpenSearch doesn't have (like its current ML stack), while OpenSearch added its own features (anomaly detection, observability tools). For Elasticsearch 7.x workloads, the migration is straightforward.

Three reasons: licensing, AWS integration, or community alignment. OpenSearch is Apache 2.0 — you can use it freely in cloud SaaS products, modify it, and embed it without Elastic's license restrictions. AWS OpenSearch Service is the natural managed option on AWS. The community is more open and accepts contributions broadly. Choose Elasticsearch when you need the latest features (vector search improvements, ESQL, agent tools) or specific Elastic Stack integrations. Choose OpenSearch when licensing matters, you're on AWS, or you want a fully open community-driven project.

For application code targeting Elasticsearch 7.x: usually yes. REST API calls, query DSL, ingest pipelines, and most clients work unchanged. For Elasticsearch 8.x: more work — some new APIs and security features don't have direct OpenSearch equivalents. Tooling: Kibana 7.x dashboards usually convert to OpenSearch Dashboards with minor changes. Use the official Elasticsearch-to-OpenSearch migration tools and test against representative queries. Most production migrations succeed within a few weeks, especially if you're already on Elasticsearch 7.x.

Kibana is not directly compatible with OpenSearch — when AWS forked Elasticsearch in 2021, it also forked Kibana into OpenSearch Dashboards. They share a common origin (Kibana 7.10) so dashboards, visualizations, and saved objects can usually be migrated, but newer Kibana versions (7.11+, 8.x) won't connect to OpenSearch and vice versa. If you switch from Elasticsearch to OpenSearch, plan to use OpenSearch Dashboards instead of Kibana. Migration tools exist for moving saved objects, but custom Kibana plugins and newer Kibana features often don't have direct equivalents.