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From jim ferenczi <>
Subject [ANNOUNCE] Apache Solr 6.4.0 released
Date Mon, 23 Jan 2017 09:17:37 GMT
23 January 2016 - Apache Solr™ 6.4.0 Available
The Lucene PMC is pleased to announce the release of Apache Solr 6.4.0.

Solr is the popular, blazing fast, open source NoSQL search platform from
the Apache Lucene project. Its major features include powerful full-text
search, hit highlighting, faceted search and analytics, rich document
parsing, geospatial search, extensive REST APIs as well as parallel SQL.
Solr is enterprise grade, secure and highly scalable, providing fault
tolerant distributed search and indexing, and powers the search and
navigation features of many of the world's largest internet sites.

Solr 6.4.0 is available for immediate download at:

Highlights of this Solr release include:

  * Addition of a HavingStream to Streaming API and Streaming Expressions
  * Addition of a priority Streaming Expression
  * Streaming expressions now support collection aliases

Machine Learning:
  * Configurable Learning-To-Rank (LTR) support: upload feature
definitions, extract feature values, upload your own machine learnt models
and use them to rerank search results.

  * Added "param" query type to facet domain filter specification to obtain
filters via query parameters
  * Any facet command can be filtered using a new parameter filter.
Example: { type:terms, field:category, filter:"user:yonik" }

Scripts / Command line:
  * A new command-line tool to manage the snapshots functionality
  * bin/solr and bin/solr.cmd now use mkroot command

SolrCloud / SolrJ
  * LukeResponse now supports dynamic fields
  * Solrj client now supports hierarchical clusters and other topics marker
  * Collection backup/restore are extensible.

  * Support Secure Impersonation / Proxy User for Solr authentication
  * Key Store type can be specified in file for SSL
  * New generic authentication plugins: 'HadoopAuthPlugin' and
'ConfigurableInternodeAuthHadoopPlugin' that delegate all functionality to
Hadoop authentication framework

Query / QueryParser / Highlighting:
  * A new highlighter: The Unified Highlighter. Try it via
hl.method=unified; many popular highlighting parameters / features are
supported. It's the highest performing highlighter, especially for large
documents. Highlighting phrase queries and exotic queries are supported
equally as well as the Original Highlighter (aka the default/standard one).
Please use this new highlighter and report issues since it will likely
become the default one day.
  * Leading wildcard in complexphrase query parser are now accepted and
optimized with the ReversedWildcardFilterFactory when it's provided

  * Use metrics-jvm library to instrument jvm internals such as GC, memory
usage and others.
  * A lot of metrics have been added to the collection: index merges, index
store I/Os, query, update, core admin, core load thread pools, shard
replication, tlog replay and replicas
  * A new /admin/metrics API to return all metrics collected by Solr via

Misc changes:
  * The new config parameter 'maxRamMB'can now limit the memory consumed by
the FastLRUCache
  * A new document processor 'SkipExistingDocumentsProcessor' that skips
duplicate inserts and ignores updates to missing docs
  * FieldCache information fetched via the mbeans handler or seen via the
UI now displays the total size used.
  * A new config flag 'enable' allows to enable/disable any cache

Please note, this release cannot be built from source with Java 8 update
121, use an earlier version instead! This is caused by a bug introduced
into the Javadocs tool shipped with that update. The workaround was too
late for this Lucene release. Of course, you can use the binary artifacts.

See the Solr CHANGES.txt files included with the release for a full list of

Jim Ferenczi

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