Download Apache Lucene & Solr 7.4.0 / 6.6.5

The Apache Software Foundation has released new versions of Lucene and Solr, with 7.4.0 and 6.6.5 as version numbers. Lucene can be deployed as part of a search engine. Namely, it can perform full text indexing. solr can then be deployed as a search engine using Lucene in the background and running as a Java Servlet within, for example, Tomcat. The announcements for these releases are as follows:

Apache Lucene 6.6.5 and Apache Solr 6.6.5 Available

The Lucene PMC is pleased to announce the release of Apache Lucene 6.6.5 and Apache Solr 6.6.5

Lucene can be downloaded from and Solr can be downloaded from http://www.apache.org/dyn/closer.lua/lucene/solr/6.6.5

Highlights of this Solr release include:

• Ability to disable configset upload via -Dconfigset.upload.enabled=false startup parameter
• Refer to external resources in various config files now disallowed

Apache Lucene 7.4.0 and Apache Solr 7.4.0 Available

The Lucene PMC is pleased to announce the release of Apache Lucene 7.4.0 and Apache Solr 7.4.0

Lucene can be downloaded from and Solr can be downloaded from solr/downloads.html

Highlights of this Lucene release include:

• Analysis
  • korean analyzer
  • Support emoji sequence tokens with ICUTokenizer
• Queries
  • The new IntervalQuery implements proximity search based on minimum-interval semantics
  • Queries may now iterate over positions and matches on a given document thanks to the Weight#matches API
• Indexing
  • New soft-delete mechanism with a configurable retention policy
  • Doc-value updates may reset a value
  • Doc-values ​​may be atomically updated with a regular document update

Highlights of this Solr release include:

• A new ‘relatedness()’ aggregate function for JSON Faceting to enable building Semantic Knowledge Graphs.
• Added the TaggerRequestHandler (AKA SolrTextTagger) for tagging text. It’s used as a component of NER/ERD systems including query-understanding.
• The “Auto Scaling” feature area has been added to and enhanced a lot.
• The “Streaming Expressions” feature area has been added to and enhanced a lot.
• Upgraded from Log4j 1.x to 2.x. Solr continues to log via SLF4J.