[ANNOUNCE] Apache Lucene 8.3.1 released

## 3 December 2019, Apache Lucene=E2=84=A2 8.3.1 available

The Lucene PMC is pleased to announce the release of Apache Lucene 8.3.1.

Apache Lucene is a high-performance, full-featured text search engine
library written entirely in Java. It is a technology suitable for
nearly any application that requires full-text search, especially
cross-platform.

This release contains numerous bug fixes, optimizations, and
improvements, some of which are highlighted below. The release is
available for immediate download at:

  <https://lucene.apache.org/core/downloads.html>

### Lucene 8.3.1 Release Highlights:

  * Bugfix: MultiTermIntervalsSource.visit() was not calling back to its vi=
sitor

Please read CHANGES.txt for a full list of changes:

  <https://lucene.apache.org/core/8_3_1/changes/Changes.html>

Note: The Apache Software Foundation uses an extensive mirroring network fo=
r
distributing releases. It is possible that the mirror you are using may not=
 have
replicated the release yet. If that is the case, please try another mirror.
This also applies to Maven access.