Tantivy 0.10.0 index format is compatible with the index format in 0.9.0.

• Added an API to easily tweak or entirely replace the default score. See TopDocs::tweak_scoreand TopScore::custom_score (@pmasurel)
• Added an ASCII folding filter (@drusellers)
• Bugfix in query.count in presence of deletes (@pmasurel)
• Added .explain(...) in Query and Weight to (@pmasurel)
• Added an efficient way to delete_all_documents in IndexWriter (@petr-tik). All segments are simply removed.

Minor

• Switched to Rust 2018 (@uvd)
• Small simplification of the code. Calling .freq() or .doc() when .advance() has never been called on segment postings should panic from now on.
• Tokens exceeding u16::max_value() - 4 chars are discarded silently instead of panicking.
• Fast fields are now preloaded when the SegmentReader is created.
• IndexMeta is now public. (@hntd187)
• IndexWriter add_document, delete_term. IndexWriter is Sync, making it possible to use it with a Arc<RwLock<IndexWriter>>. add_document and delete_term can only require a read lock. (@pmasurel)
• Introducing Opstamp as an expressive type alias for u64. (@petr-tik)
• Stamper now relies on AtomicU64 on all platforms (@petr-tik)
• Bugfix - Files get deleted slightly earlier
• Compilation resources improved (@fdb-hiroshima)

How to update?

Your program should be usable as is.

Fast fields

Fast fields used to be accessed directly from the SegmentReader. The API changed, you are now required to acquire your fast field reader via the segment_reader.fast_fields(), and use one of the typed method:

• .u64(), .i64() if your field is single-valued ;
• .u64s(), .i64s() if your field is multi-valued ;
• .bytes() if your field is bytes fast field.