Support Matrix
Supported Java versions, search backends, Kafka versions, and operating systems.
Java
| Version | Status |
|---|---|
| Java 17 | Supported (minimum required) |
| Java 21 | Supported |
Lucille is compiled targeting Java 17. Both versions are tested in CI via GitHub Actions using Eclipse Temurin distributions.
Build Tool
Apache Maven 3.x is required to build Lucille from source.
Search Backends
The following backends are supported via the Indexer component.
| Backend | Tested Version | Notes |
|---|---|---|
| Apache Solr | 9.x | Client: solr-solrj 9.8.0 |
| OpenSearch | 2.x | Client: opensearch-java 2.11.1 |
| Elasticsearch | 8.x | Client: elasticsearch-java 8.18.4 |
| CSV | — | Writes indexed documents to a local CSV file; no server required |
| Nop | — | Discards output; used for testing and dry runs |
Kafka (Distributed Mode)
| Component | Version |
|---|---|
| kafka-clients | 4.0.0 |
| Kafka broker | 3.x, 4.x |
Kafka is only required when running in distributed mode (-usekafka). Local mode uses in-memory queues and has no Kafka dependency.
Operating Systems
| OS | Status |
|---|---|
| Linux | Supported; used in production deployments |
| macOS | Supported; tested in CI |
| Windows | Not officially tested |
License
Apache License, Version 2.0. See LICENSE in the repository.