THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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- Lucene 9 takes advantage of Java VarHandles, introduced in Java 9, to speed up indexing and some queries.
- Lucene now enforces that a field has the same schema across all documents in order to enable optimizations that take advantage of the index by default.
- ConcurrentMergeScheduler now assumes fast I/O, likely improving indexing speed in case where heuristics would incorrectly detect whether the system had fast I/O or not.
- Encoding of postings lists changed from FOR-delta to PFOR-delta.
Other
- Lucene 9 now longer has split packages. This required renaming some packages outside of the lucene-core JAR, so you will need to adjust some imports accordingly. See https://lucene.apache.org/core/9_0_0/MIGRATE.html for more information.
Further details of changes are available in the change log available at: http://lucene.apache.org/core/9_0/changes/Changes.html
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