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Add info about the Spanish Plural Stemmer #3040

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Add info about the Spanish Plural Stemmer #3040

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41 changes: 39 additions & 2 deletions solr/solr-ref-guide/modules/indexing-guide/pages/language-analysis.adoc
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Expand Up @@ -3223,14 +3223,15 @@ With class name (legacy)::

=== Spanish

Solr includes two stemmers for Spanish: one in the `solr.SnowballPorterFilterFactory language="Spanish"`, and a lighter stemmer called `solr.SpanishLightStemFilterFactory`.
Solr includes three stemmers for Spanish: the `solr.SnowballPorterFilterFactory language="Spanish"`, a lighter stemmer called `solr.SpanishLightStemFilterFactory` and a plural stemmer called `solr.SpanishPluralStemFilter` (https://mices.co/mices2021/slides/Xavier-Sanchez_Spanish-Stemmers-Solr.pdf[slides], https://medium.com/inside-wallapop/spanish-plural-stemmer-matching-plural-and-singular-forms-in-spanish-using-lucene-93e005e38373[article]) that implements the rules described in http://www.wikilengua.org/index.php/Plural_(formación) and can be useful in conjunction with synonyms as it produces meaningful tokens in the singular form (e.g. `amigo`, not `amig`).

Lucene includes an example stopword list.

*Factory class:* `solr.SpanishStemFilterFactory`

*Arguments:* None

*Example:*
*Example 1:*

[tabs#lang-spanish]
======
Expand Down Expand Up @@ -3267,6 +3268,42 @@ With class name (legacy)::

*Out:* "tor", "tor", "tor"

*Example 2:*

[tabs#lang-spanish]
======
With name::
+
====
[source,xml]
----
<analyzer>
<tokenizer name="standard"/>
<filter name="lowercase"/>
<filter name="spanishPluralStem"/>
</analyzer>
----
====

With class name (legacy)::
+
====
[source,xml]
----
<analyzer>
<tokenizer class="solr.StandardTokenizerFactory"/>
<filter class="solr.LowerCaseFilterFactory"/>
<filter class="solr.SpanishPluralStemFilterFactory"/>
</analyzer>
----
====
======

*In:* "ases esprais paces bits amigos cantar caries"

*Tokenizer to Filter:* "ases", "esprais", "paces", "bits", "amigos", "cantar", "caries"

*Out:* "as", "espray", "paz", "bit", "amigo", "cantar", "caries"

=== Swedish

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