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Lucene-9336: Changes.txt and migrate.md addition for RegExp enhancements (#1515) 

Added notes for new \w \s etc support
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markharwood 2020-05-14 11:51:59 +01:00 committed by GitHub
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4
lucene/CHANGES.txt
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@ -60,6 +60,10 @@ API Changes
Improvements
* LUCENE-9336: RegExp query now supports \w \W \d \D \s \S expressions.
This is a break with previous behaviour where these were (mis)interpreted
as literally the characters w W d etc. (Mark Harwood)
* LUCENE-8757: When provided with an ExecutorService to run queries across
multiple threads, IndexSearcher now groups small segments together, up to
250k docs per slice. (Atri Sharma via Adrien Grand)

4
lucene/MIGRATE.md
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@ -1,5 +1,9 @@
# Apache Lucene Migration Guide
## RegExp certain regular expressions now match differently (LUCENE-9336)
The commonly used regular expressions \w \W \d \D \s and \S now work the same way [Java Pattern](https://docs.oracle.com/javase/tutorial/essential/regex/pre_char_classes.html#CHART) matching works. Previously these expressions were (mis)interpreted as searches for the literal characters w, d, s etc.
## NGramFilterFactory "keepShortTerm" option was fixed to "preserveOriginal" (LUCENE-9259)
The factory option name to output the original term was corrected in accordance with its Javadoc.