Github user NightOwl888 commented on the issue:
https://github.com/apache/lucenenet/pull/213
Hi there.
The Lucene.Net.Contrib package is now dead (it died out with Lucene.Net
3.x), therefore it doesn't make much sense to list it with the new pre-release
packages. We might want to list four 3.x packages under a Lucene.Net 3.0.3
sub-heading, though:
1. [Lucene.Net](https://www.nuget.org/packages/Lucene.Net/3.0.3) - Core
library
2.
[Lucene.Net.Contrib](https://www.nuget.org/packages/Lucene.Net.Contrib/3.0.3) -
Various user contributed functionality and extras
3.
[Lucene.Net.Contrib.Spatial](https://www.nuget.org/packages/Lucene.Net.Contrib.Spatial/3.0.3)
- Geospatial Search
4.
[Lucene.Net.Contrib.Spatial.NTS](https://www.nuget.org/packages/Lucene.Net.Contrib.Spatial.NTS/3.0.3)
- Geospatial search with support for NetTopologySuite.
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