compare
OpenSearch vs Apache Solr
The same facts for both, read from GitHub every night, and the relation a person reviewed.
| Fact | OpenSearch | Apache Solr |
|---|---|---|
| Language | Java | Java |
| Licence | Apache-2.0 | Apache-2.0 |
| Stars | 14k | 1.7k |
| Latest | 3.9.0 | releases/solr/10.0.0 |
| Last push | 2026-10-06 | 2026-10-06 |
| Release cadence | about 43 days between releases | too few releases |
| Active contributors | 104 commit authors on the default branch in the last 90 days | 40 commit authors on the default branch in the last 90 days |
| Flags | none | none |
How they relate
Both replace Elasticsearch. Alternatives to Elasticsearch →
Full replacementOpenSearchFork of Elasticsearch 7.10.2, APIs have diverged since.
Full replacementApache SolrAlso built on Lucene, with its own query API.
OpenSearch
- 3.9.02026-09-29Compatible with OpenSearch and OpenSearch Dashboards version 3.9.0
- 3.8.02026-08-05Compatible with OpenSearch and OpenSearch Dashboards version 3.8.0
- 2.19.62026-07-06Compatible with OpenSearch and OpenSearch Dashboards version 2.19.6
- 3.7.02026-06-09Compatible with OpenSearch and OpenSearch Dashboards version 3.7.0
- 3.6.02026-04-07Compatible with OpenSearch and OpenSearch Dashboards version 3.6.0
Apache Solr
This repository publishes tags, not GitHub releases.
OpenSearch
✓ signed The latest release, 3.9.0, carries a signature GitHub verified.
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Apache Solr
unsigned The latest release, releases/solr/10.0.0, carries no signature GitHub could verify.
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