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@ -5,7 +5,7 @@
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++++
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Provides <<algorithmic-stemmers,algorithmic stemming>> for the English language,
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based on the http://snowball.tartarus.org/algorithms/porter/stemmer.html[Porter
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based on the https://snowballstem.org/algorithms/porter/stemmer.html[Porter
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stemming algorithm].
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This filter tends to stem more aggressively than other English
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@ -9,7 +9,7 @@ some with additional variants. For a list of supported languages, see the
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<<analysis-stemmer-tokenfilter-language-parm,`language`>> parameter.
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When not customized, the filter uses the
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http://snowball.tartarus.org/algorithms/porter/stemmer.html[porter stemming
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https://snowballstem.org/algorithms/porter/stemmer.html[porter stemming
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algorithm] for English.
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[[analysis-stemmer-tokenfilter-analyze-ex]]
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@ -112,17 +112,17 @@ Language-dependent stemming algorithm used to stem tokens. If both this and the
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.Valid values for `language`
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====
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Valid values are sorted by language. Defaults to
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http://snowball.tartarus.org/algorithms/porter/stemmer.html[*`english`*].
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https://snowballstem.org/algorithms/porter/stemmer.html[*`english`*].
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Recommended algorithms are *bolded*.
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Arabic::
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{lucene-analysis-docs}/ar/ArabicStemmer.html[*`arabic`*]
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Armenian::
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http://snowball.tartarus.org/algorithms/armenian/stemmer.html[*`armenian`*]
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https://snowballstem.org/algorithms/armenian/stemmer.html[*`armenian`*]
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Basque::
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http://snowball.tartarus.org/algorithms/basque/stemmer.html[*`basque`*]
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https://snowballstem.org/algorithms/basque/stemmer.html[*`basque`*]
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Bengali::
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https://www.tandfonline.com/doi/abs/10.1080/02564602.1993.11437284[*`bengali`*]
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@ -134,36 +134,36 @@ Bulgarian::
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http://members.unine.ch/jacques.savoy/Papers/BUIR.pdf[*`bulgarian`*]
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Catalan::
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http://snowball.tartarus.org/algorithms/catalan/stemmer.html[*`catalan`*]
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https://snowballstem.org/algorithms/catalan/stemmer.html[*`catalan`*]
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Czech::
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https://dl.acm.org/doi/10.1016/j.ipm.2009.06.001[*`czech`*]
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Danish::
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http://snowball.tartarus.org/algorithms/danish/stemmer.html[*`danish`*]
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https://snowballstem.org/algorithms/danish/stemmer.html[*`danish`*]
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Dutch::
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http://snowball.tartarus.org/algorithms/dutch/stemmer.html[*`dutch`*],
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http://snowball.tartarus.org/algorithms/kraaij_pohlmann/stemmer.html[`dutch_kp`]
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https://snowballstem.org/algorithms/dutch/stemmer.html[*`dutch`*],
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https://snowballstem.org/algorithms/kraaij_pohlmann/stemmer.html[`dutch_kp`]
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English::
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http://snowball.tartarus.org/algorithms/porter/stemmer.html[*`english`*],
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https://snowballstem.org/algorithms/porter/stemmer.html[*`english`*],
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https://ciir.cs.umass.edu/pubfiles/ir-35.pdf[`light_english`],
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http://snowball.tartarus.org/algorithms/lovins/stemmer.html[`lovins`],
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https://snowballstem.org/algorithms/lovins/stemmer.html[`lovins`],
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https://www.researchgate.net/publication/220433848_How_effective_is_suffixing[`minimal_english`],
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http://snowball.tartarus.org/algorithms/english/stemmer.html[`porter2`],
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https://snowballstem.org/algorithms/english/stemmer.html[`porter2`],
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{lucene-analysis-docs}/en/EnglishPossessiveFilter.html[`possessive_english`]
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Estonian::
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https://lucene.apache.org/core/{lucene_version_path}/analyzers-common/org/tartarus/snowball/ext/EstonianStemmer.html[*`estonian`*]
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Finnish::
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http://snowball.tartarus.org/algorithms/finnish/stemmer.html[*`finnish`*],
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https://snowballstem.org/algorithms/finnish/stemmer.html[*`finnish`*],
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http://clef.isti.cnr.it/2003/WN_web/22.pdf[`light_finnish`]
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French::
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https://dl.acm.org/citation.cfm?id=1141523[*`light_french`*],
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http://snowball.tartarus.org/algorithms/french/stemmer.html[`french`],
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https://snowballstem.org/algorithms/french/stemmer.html[`french`],
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https://dl.acm.org/citation.cfm?id=318984[`minimal_french`]
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Galician::
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@ -172,8 +172,8 @@ http://bvg.udc.es/recursos_lingua/stemming.jsp[`minimal_galician`] (Plural step
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German::
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https://dl.acm.org/citation.cfm?id=1141523[*`light_german`*],
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http://snowball.tartarus.org/algorithms/german/stemmer.html[`german`],
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http://snowball.tartarus.org/algorithms/german2/stemmer.html[`german2`],
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https://snowballstem.org/algorithms/german/stemmer.html[`german`],
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https://snowballstem.org/algorithms/german2/stemmer.html[`german2`],
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http://members.unine.ch/jacques.savoy/clef/morpho.pdf[`minimal_german`]
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Greek::
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@ -183,18 +183,18 @@ Hindi::
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http://computing.open.ac.uk/Sites/EACLSouthAsia/Papers/p6-Ramanathan.pdf[*`hindi`*]
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Hungarian::
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http://snowball.tartarus.org/algorithms/hungarian/stemmer.html[*`hungarian`*],
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https://snowballstem.org/algorithms/hungarian/stemmer.html[*`hungarian`*],
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https://dl.acm.org/citation.cfm?id=1141523&dl=ACM&coll=DL&CFID=179095584&CFTOKEN=80067181[`light_hungarian`]
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Indonesian::
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http://www.illc.uva.nl/Publications/ResearchReports/MoL-2003-02.text.pdf[*`indonesian`*]
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Irish::
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http://snowball.tartarus.org/otherapps/oregan/intro.html[*`irish`*]
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https://snowballstem.org/otherapps/oregan/[*`irish`*]
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Italian::
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https://www.ercim.eu/publication/ws-proceedings/CLEF2/savoy.pdf[*`light_italian`*],
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http://snowball.tartarus.org/algorithms/italian/stemmer.html[`italian`]
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https://snowballstem.org/algorithms/italian/stemmer.html[`italian`]
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Kurdish (Sorani)::
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{lucene-analysis-docs}/ckb/SoraniStemmer.html[*`sorani`*]
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https://svn.apache.org/viewvc/lucene/dev/branches/lucene_solr_5_3/lucene/analysis/common/src/java/org/apache/lucene/analysis/lt/stem_ISO_8859_1.sbl?view=markup[*`lithuanian`*]
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Norwegian (Bokmål)::
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http://snowball.tartarus.org/algorithms/norwegian/stemmer.html[*`norwegian`*],
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https://snowballstem.org/algorithms/norwegian/stemmer.html[*`norwegian`*],
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{lucene-analysis-docs}/no/NorwegianLightStemmer.html[*`light_norwegian`*],
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{lucene-analysis-docs}/no/NorwegianMinimalStemmer.html[`minimal_norwegian`]
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@ -217,26 +217,26 @@ Norwegian (Nynorsk)::
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Portuguese::
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https://dl.acm.org/citation.cfm?id=1141523&dl=ACM&coll=DL&CFID=179095584&CFTOKEN=80067181[*`light_portuguese`*],
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pass:macros[http://www.inf.ufrgs.br/~buriol/papers/Orengo_CLEF07.pdf[`minimal_portuguese`\]],
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http://snowball.tartarus.org/algorithms/portuguese/stemmer.html[`portuguese`],
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https://snowballstem.org/algorithms/portuguese/stemmer.html[`portuguese`],
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https://www.inf.ufrgs.br/\~viviane/rslp/index.htm[`portuguese_rslp`]
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Romanian::
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http://snowball.tartarus.org/algorithms/romanian/stemmer.html[*`romanian`*]
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https://snowballstem.org/algorithms/romanian/stemmer.html[*`romanian`*]
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Russian::
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http://snowball.tartarus.org/algorithms/russian/stemmer.html[*`russian`*],
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https://snowballstem.org/algorithms/russian/stemmer.html[*`russian`*],
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https://doc.rero.ch/lm.php?url=1000%2C43%2C4%2C20091209094227-CA%2FDolamic_Ljiljana_-_Indexing_and_Searching_Strategies_for_the_Russian_20091209.pdf[`light_russian`]
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Spanish::
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https://www.ercim.eu/publication/ws-proceedings/CLEF2/savoy.pdf[*`light_spanish`*],
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http://snowball.tartarus.org/algorithms/spanish/stemmer.html[`spanish`]
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https://snowballstem.org/algorithms/spanish/stemmer.html[`spanish`]
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Swedish::
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http://snowball.tartarus.org/algorithms/swedish/stemmer.html[*`swedish`*],
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https://snowballstem.org/algorithms/swedish/stemmer.html[*`swedish`*],
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http://clef.isti.cnr.it/2003/WN_web/22.pdf[`light_swedish`]
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Turkish::
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http://snowball.tartarus.org/algorithms/turkish/stemmer.html[*`turkish`*]
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https://snowballstem.org/algorithms/turkish/stemmer.html[*`turkish`*]
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====
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`name`::
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