Compare Elasticsearch alternatives
Elasticsearch was Apache 2.0-licensed until 2021, when Elastic moved it to the source-available SSPL and Elastic License in response to cloud providers reselling it without contributing back. Elastic added the OSI-approved AGPLv3 as another licensing option in 2024, but the underlying reason many teams look for alternatives — wanting a database with an unambiguous open-source license and no vendor-controlled relicensing risk — hasn't gone away.
If full-text and log search is your use case, look at dedicated search or observability tools in the broader ecosystem. If your actual need is vector similarity search for AI applications rather than traditional text search, Weaviate, Qdrant, and Milvus are purpose-built vector databases that also support hybrid search combining vectors with metadata filtering.
FAQ
Is there a free, open-source alternative to Elasticsearch?
Yes, depending on your use case. Weaviate, Qdrant, and Milvus are open-source, self-hostable databases for vector and hybrid search workloads.
What's the best open-source alternative to Elasticsearch?
If your workload is vector or semantic search rather than traditional full-text search, Qdrant and Weaviate are both mature, widely-used options with permissive licenses (Apache-2.0 and BSD-3-Clause respectively).
Why do teams look for an Elasticsearch alternative?
Elasticsearch's 2021 move away from Apache 2.0 to the source-available SSPL left some teams wanting a database under an unambiguous open-source license instead of one a single vendor can relicense.
What are the top open-source alternatives to Elasticsearch?
Browse all open-source alternatives to Elasticsearch above, or explore the full Vector Database category for more options.