Information Retrieval Adventure

Experimental repository for exploring information retrieval concepts using Apache Lucene (versions 4-8), Apache Solr, and Elasticsearch.

Features

• Multi-version testing: Separate modules for Lucene 4.x, 5.x, 6.x, 7.x, 8.x, and Elasticsearch 7.x
• Version verification: Automated testing ensures correct library versions are loaded (via test-commons module)
• Real-world examples: Code from Stack Overflow questions and production use cases
• IR Techniques: Custom analyzers, scoring functions, faceting, phonetic search, and more

What's Inside

• Indexing Russian Wikipedia pages (titles and URIs)
• Document values and ordinals manipulation
• Managed schema CRUD operations
• Custom analyzers and token filters
• Phonetic search implementations
• Query elevation and boosting
• BM25F scoring implementations
• Solr Cloud and CDCR configurations
• Elasticsearch custom plugins
• Post-filters and custom sorting via ValueSourceParser

Modules

Module	Lucene Version	Description
test-commons	N/A	Shared testing utilities and version verification
lucene4	4.10.4	Lucene 4.x experiments and BM25F implementation
lucene5	5.5.5	Custom analyzers and token filters
lucene6	6.6.6	Plugin development and custom scoring
lucene7	7.7.2	Modern Lucene API examples
lucene8	8.10.1	Latest features, Solr configurations, Wikipedia indexing
elasticsearch7	7.16.1	Custom analyzers, plugins, and pipeline processors

Building

# Build all modules
mvn clean install

# Build specific module
mvn clean install -pl lucene8

# Run tests
mvn test

# Verify versions are correct
mvn test -Dtest=*VersionTest

Version Verification

This repository includes automated version verification to ensure each module loads the correct Lucene version:

# Run version verification tests
mvn test -Dtest=*VersionTest

# Generate version compatibility report (via GitHub Actions)
# See .github/workflows/version-verification.yml

See test-commons/README.md for details on the testing infrastructure.

CI/CD

GitHub Actions workflows verify:

• ✅ All modules build successfully

• ✅ Correct Lucene versions are loaded in each module

• ✅ No dependency conflicts

• ✅ Code formatting compliance

See .github/workflows/README.md for workflow details.