Package org.opensearch.analysis.common

Class EnglishPluralStemFilter.EnglishPluralStemmer

java.lang.Object

org.opensearch.analysis.common.EnglishPluralStemFilter.EnglishPluralStemmer

Enclosing class:

EnglishPluralStemFilter

public static class EnglishPluralStemFilter.EnglishPluralStemmer
extends Object

Plural stemmer for English based on the EnglishMinimalStemFilter

This stemmer removes plurals but beyond EnglishMinimalStemFilter adds four new suffix rules to remove dangling e characters:

• xes - "boxes" becomes "box"
• sses - "dresses" becomes "dress"
• shes - "dishes" becomes "dish"
• tches - "watches" becomes "watch"

See https://github.com/elastic/elasticsearch/issues/42892

In addition the s stemmer logic is amended so that

• ees->ee so that bees matches bee
• ies->y only on longer words to that ties matches tie
• oes->o rule so that tomatoes matches tomato but retains e for some words eg shoes to shoe

Field Summary

Fields

Modifier and Type	Field	Description
static final char[][]	chesExceptions
static final char[][]	oesExceptions

Constructor Summary

Constructors

Constructor	Description
EnglishPluralStemmer()

Method Summary

Modifier and Type	Method	Description
int	stem(char[] s, int len)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

oesExceptions

public static final char[][] oesExceptions

chesExceptions

public static final char[][] chesExceptions

Constructor Details

EnglishPluralStemmer

public EnglishPluralStemmer()

Method Details

stem

public int stem(char[] s,
 int len)