Tomoko Uchida created LUCENE-8752:
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Summary: Apply a patch to kuromoji dictionary to properly handle
Japanese new era '令和' (REIWA)
Key: LUCENE-8752
URL: https://issues.apache.org/jira/browse/LUCENE-8752
Project: Lucene - Core
Issue Type: Improvement
Components: modules/analysis
Reporter: Tomoko Uchida
As of May 1st, 2019, Japanese era '元号' (Gengo) will be set to '令和' (Reiwa). See
this article for more details:
[https://www.bbc.com/news/world-asia-47769566]
Currently '令和' is splitted up to '令' and '和' by {{JapaneseTokenizer}}. It
should be tokenized as one word so that Japanese texts including era names are
searched as users expect. Because the default Kuromoji dictionary
(mecab-ipadic) has not been maintained since 2007, a one-line patch to the
source CSV file is needed for this era change.
Era name is used in many official or formal documents in Japan, so it would be
desirable the search systems properly handle this without adding a user
dictionary or using phrase query. :)
FYI, JDK DateTime API will support the new era (in the next updates.)
[https://blogs.oracle.com/java-platform-group/a-new-japanese-era-for-java]
The patch is available here:
[https://github.com/apache/lucene-solr/pull/632]
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