[hibernate-dev] [Search] Deprecating @Boost and related options

[Sanne Grinovero]

Index time boosting is deprecated in Apache Lucene 6, and will be
removed in Lucene 7.

While we currently are using Lucene 5, since we'll likely jump
directly to Lucene 7 with the next major version of Hibernate Search,
I think we should prepare our users already.

Let's deprecate @Boost and any option to control index-time boosting,
so that people can start already to move to query-time boosting.

 - https://hibernate.atlassian.net/browse/HSEARCH-2735