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https://stackoverflow.com/questions/4612558/does-lucene-support-unicode
Lucene does support unicode, but there are limitations. For example some document readers don't support unicode. Also, lucene does things like pluralize or un-pluralize words. When you are using a foreign language some of that goes away.
https://stackoverflow.com/questions/23030329/lucene-encoding-java
Lucene stores terms in UTF-8. (See Lucene's BytesRef class) Java internally stores everything in UTF-16. (Java's String is UTF-16). So, Lucene's BytesRef gives you a constructor where it converts UTF16 to UTF8. Hence Java's String can be used without any issues. For example, TextField what you have used in your code uses String for Field value.
https://cwiki.apache.org/confluence/display/solr/LanguageAnalysis
Jun 28, 2019 · Example set of Catalan stopwords (Be sure to switch your browser encoding to UTF-8) Chinese, Japanese, Korean. Lucene provides support for these languages with CJKTokenizer, which indexes bigrams and does some character folding of full-width forms.
https://grokbase.com/t/centos/centos/0874xz3zw2/utf-8-support-in-pcre/oldest
UTF-8 support No Unicode properties support Newline character is LF Internal link size = 2 POSIX malloc threshold = 10 Default match limit = 10000000 Default recursion depth limit = 10000000 Match recursion uses stack Ubuntu ===== ashee@ubuntu:~$ pcretest -C PCRE version 7.4 2007-09-21 Compiled with UTF-8 support Unicode properties support ...
http://lucene.apache.org/
12 March 2014 - Apache Lucene 4.8 and Apache Solr 4.8 will require Java 7¶ The Apache Lucene/Solr committers decided with a large majority on the vote to require Java 7 for the next minor release of Apache Lucene and Apache Solr (version 4.8)! The next …
https://framework.zend.com/manual/1.12/en/zend.search.lucene.charset.html
Zend_Search_Lucene works with the UTF-8 charset internally. Index files store unicode data in Java's "modified UTF-8 encoding". Zend_Search_Lucene core completely supports this encoding with one exception. [1] Zend_Search_Lucene Actual input data encoding may be specified through Zend_Search_Lucene API.Data will be automatically converted into UTF-8 encoding.
https://lucene.apache.org/core/8_1_0/core/org/apache/lucene/codecs/lucene80/package-summary.html
In version 2.4, Strings are now written as true UTF-8 byte sequence, not Java's modified UTF-8. See LUCENE-510 for details. ... In version 4.6, FieldInfos were extended to support per-field DocValues generation, to allow updating NumericDocValues fields.
https://grokbase.com/t/lucene/solr-user/1096pg9e0w/how-to-enable-unicode-support-in-solr
Lance Norskog 1) The XML file must include the UTF-8 encoding metadata in the first line. 2) If you are using Tomcat: Tomcat comes without UTF-8 as the default. The Solr wiki gives the directions on how to fix this. 3) If you are using Windows: Windows does not use UTF-8 by default.
https://lucene.472066.n3.nabble.com/SOLR-support-for-unicode-td2790512.html
Apr 07, 2011 · SOLR support for unicode?. Hi, We are trying to index heterogenous data using SOLR, some of the sources have some unicode characters like Zone™ but SOLR is converting them to Zone . Any idea how to...
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