Solr

Apache Solr is an open-source search platform built on Lucene that delivers sub-second full-text search and real-time analytics for massive datasets.

Solr powers search for giants like Adobe, Verizon, and AT&T by leveraging the Lucene library for high-performance indexing. It handles petabytes of data across distributed clusters (SolrCloud) using a REST-like API to manage JSON, XML, and CSV documents. Key features include faceted navigation, hit highlighting, and advanced spatial search (geospatial filtering). Because it runs in a Java servlet container like Jetty, deployment is straightforward and scales horizontally to meet high-traffic demands.

https://solr.apache.org/