Elasticsearch vs Weaviate
A side-by-side comparison of two self-hosted search engines options — licensing, setup difficulty, resource needs, and what each one replaces.
Elasticsearch
Distributed search and analytics engine
VS
Weaviate
Open-source vector database for semantic and AI search
| Feature | Elasticsearch | Weaviate |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Health score | 100 · Excellent | 95 · Excellent |
| Category | Search Engines | Search Engines |
| License | Elastic-2.0 | BSD-3-Clause |
| Language | Java | Go |
| Setup difficulty | Hard | Medium |
| Min. RAM | 2,048 MB | 2,048 MB |
| Deployment | docker, kubernetes, bare-metal | docker, kubernetes, helm |
| GitHub stars | ★ 77,969 | ★ 16,841 |
| First released | 2010 | 2019 |
| Replaces | Algolia, Splunk | Pinecone, Algolia |
What are Elasticsearch and Weaviate?
Elasticsearch
Elasticsearch is a distributed, RESTful search and analytics engine capable of addressing a wide variety of use cases. It stores and indexes large volumes of data for fast full-text and structured search.
- Distributed full-text search
- Aggregations and analytics
- Horizontal scalability
- Rich query DSL
Weaviate
Weaviate is an open-source vector database that stores objects and their vector embeddings for semantic search. It enables AI-powered similarity search, retrieval-augmented generation and hybrid queries.
- Vector and hybrid search
- Built-in vectorization modules
- GraphQL and REST APIs
- Horizontal scaling
Elasticsearch vs Weaviate: key differences
Elasticsearch is written in Java, while Weaviate is built with Go. Licensing differs — Elastic-2.0 for Elasticsearch versus BSD-3-Clause for Weaviate. Elasticsearch is the more established project (first released 2010), while Weaviate arrived in 2019. Elasticsearch has the considerably larger community, at 77,969 GitHub stars versus 16,841.
Why pick each one
Choose Elasticsearch if…
- Extremely powerful and mature
- Huge ecosystem
Watch out for
- Resource intensive
- Complex to tune
Choose Weaviate if…
- Great for AI semantic search
- Easy to start
Watch out for
- Memory hungry with large datasets
Frequently asked questions
Is Elasticsearch or Weaviate better?
Neither is universally better. Elasticsearch has the larger community, while Weaviate is simpler to set up (medium difficulty). Choose based on the comparison table above and your own setup.
Are Elasticsearch and Weaviate free and open-source?
Yes. Elasticsearch is licensed under Elastic-2.0 and Weaviate under BSD-3-Clause. Both can be self-hosted at no software cost.
Can I run Elasticsearch and Weaviate with Docker?
Elasticsearch: yes. Weaviate: yes.