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1. apache/lucene apache/lucene Public

   Apache Lucene open-source search software

   Java 3.6k 1.4k

2. apache/solr apache/solr Public

   Apache Solr open-source search software

   Java 1.7k 863

3. elasticsearch elasticsearch Public

   Forked from elastic/elasticsearch

   Free and Open Source, Distributed, RESTful Search Engine

   Java

4. SciDB-Optimization SciDB-Optimization Public

   Built on SciDB, a multidimensional array database. A system with distributed ingestion, query variant generation, multi-tenant query isolation, benchmarking pipeline, and ML-aided optimization buil…

   Python

5. Multi-Stage-Retrieval-and-Ranking-Engine Multi-Stage-Retrieval-and-Ranking-Engine Public

   A distributed retrieval engine with tri-stage ranking using Reciprocal Rank Fusion (RRF) and Microsoft LightGBM Learning-to-Rank, built on Apache Solr BM25 lexical retrieval and Google ScaNN semant…

   Java

6. Hybrid-Retrieval-and-Ranking-Engine Hybrid-Retrieval-and-Ranking-Engine Public

   A distributed engine that fuses Apache Solr’s BM25 keyword retrieval with pgvector-based vector search.

   Java