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https://issues.apache.org/jira/browse/LUCENE-7420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15427888#comment-15427888
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J Pardos commented on LUCENE-7420:
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The attached patch stems four character words not ending in 's'.
> SpanishLightStemmer stemming errors
> -----------------------------------
>
> Key: LUCENE-7420
> URL: https://issues.apache.org/jira/browse/LUCENE-7420
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/analysis
> Affects Versions: 5.x, 6.x
> Reporter: J Pardos
> Priority: Minor
> Labels: analysis, stemming
> Attachments: SpanishLightStemmer.java.patch
>
>
> SpanishLightStemmer only applies stemming if the original word is 5
> characters or longer. It tries to removing gender and numbers, removing final
> vowel and s if they exist.
> So, perro, perra, perros and perras (dog, bitch, dogs and bitches) all become
> 'perr'.
> The problem arises with shorter words. Gatos and Gatas (cats / female cats)
> all become 'gat', but the singular forms (gato, gata) are below the 5
> character threshold, so they wouldn't be stemmed.
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