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https://issues.apache.org/jira/browse/LUCENE-8876?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16871423#comment-16871423
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Mark Harwood commented on LUCENE-8876:
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{quote} but then doesn't it mean that exceptions of the 2nd rule are always
ignored?
{quote}
Good point. Rule 1 exceptions are odd too - I have not found a single common
English word that ends in aies or eies.
> EnglishMinimalStemmer does not implement s-stemmer paper correctly?
> -------------------------------------------------------------------
>
> Key: LUCENE-8876
> URL: https://issues.apache.org/jira/browse/LUCENE-8876
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/analysis
> Reporter: Mark Harwood
> Priority: Minor
>
> The EnglishMinimalStemmer fails to stem ees suffixes like bees, trees and
> employees.
> The [original
> paper|[http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.104.9828&rep=rep1&type=pdf]]
> has this table of rules:
> !https://user-images.githubusercontent.com/170925/59616454-5dc7d580-911c-11e9-80b0-c7a59458c5a7.png!
> The notes accompanying the table state :
> {quote}"the first applicable rule encountered is the only one used"
> {quote}
>
> For the {{ees}} and {{oes}} suffixes I think EnglishMinimalStemmer
> misinterpreted the rule logic and consequently {{bees != bee}} and {{tomatoes
> != tomato}}. The {{oes}} and {{ees}} suffixes are left intact.
> "The first applicable rule" for {{ees}} could be interpreted as rule 2 or 3
> in the table depending on if you take {{applicable}} to mean "the THEN part
> of the rule has fired" or just that the suffix was referenced in the rule.
> EnglishMinimalStemmer has assumed the latter and I think it should be the
> former. We should fall through into rule 3 for {{ees}} and {{oes}} (remove
> any trailing S). That's certainly the conclusion I came to independently
> testing on real data.
> There are some additional changes I'd like to see in a plural stemmer but I
> won't list them here - the focus should be making the code here match the
> original paper it references.
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