Expose the Lucene Korean analyzer module in a plugin (#30397)

This change adds a new plugin called `analysis-nori` that exposes
Korean text analysis in es using the new Lucene Korean analyzer module named (`nori`).
The plugin adds:
* a Korean analyzer: `nori`
* a Korean tokenizer: `nori_tokenizer`
* a part of speech stop filter: `nori_part_of_speech`
* a filter that can replace Hanja characters with their Hangul transcription: `nori_readingform`

Author: jimczi

docs/CHANGELOG.asciidoc

@@ -146,6 +146,9 @@ The new <<mapping-ignored-field,`_ignored`>> field allows to know which fields
 got ignored at index time because of the <<ignore-malformed,`ignore_malformed`>>
 option. ({pull}30140[#29658])
 
+A new analysis plugin called `analysis_nori` that exposes the Lucene Korean
+analysis module.  ({pull}30397[#30397])
+
 [float]
 === Enhancements
 

docs/build.gradle

@@ -32,6 +32,7 @@ integTestCluster {
   configFile 'analysis/synonym.txt'
   configFile 'analysis/stemmer_override.txt'
   configFile 'userdict_ja.txt'
+  configFile 'userdict_ko.txt'
   configFile 'KeywordTokenizer.rbbi'
   extraConfigFile 'hunspell/en_US/en_US.aff', '../server/src/test/resources/indices/analyze/conf_dir/hunspell/en_US/en_US.aff'
   extraConfigFile 'hunspell/en_US/en_US.dic', '../server/src/test/resources/indices/analyze/conf_dir/hunspell/en_US/en_US.dic'