THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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- Support for indexing high-dimensionality numeric vectors to perform nearest-neighbor search, using the Hierarchical Navigable Small World graph algorithm.
- New Analyzers for Serbian, Nepali, and Tamil languages
- IME-friendly autosuggest for Japanese
- Snowball 2, adding Hindi, Indonesian, Nepali, Serbian, Tamil, and Yiddish stemmers.
- New normalization/stemming for Swedish and Norwegian
Optimizations
- Up to 400% faster taxonomy faceting.
- 10-15% faster indexing of multi-dimensional points.
- Several times faster sorting on fields that are indexed with points. This optimization used to be an opt-in in late 8.x releases and is new opt-out as of 9.0.
- ConcurrentMergeScheduler now assumes fast I/O, likely improving indexing speed in case where heuristics would incorrectly detect whether the system had modern I/O or not.
- Encoding of postings lists changed from FOR-delta to PFOR-delta to save further disk space.
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