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182 changes: 182 additions & 0 deletions
182
...analysis-common/src/main/java/org/opensearch/analysis/common/EnglishPluralStemFilter.java
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/* | ||
* SPDX-License-Identifier: Apache-2.0 | ||
* | ||
* The OpenSearch Contributors require contributions made to | ||
* this file be licensed under the Apache-2.0 license or a | ||
* compatible open source license. | ||
*/ | ||
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/* | ||
* Licensed to Elasticsearch under one or more contributor | ||
* license agreements. See the NOTICE file distributed with | ||
* this work for additional information regarding copyright | ||
* ownership. Elasticsearch licenses this file to you under | ||
* the Apache License, Version 2.0 (the "License"); you may | ||
* not use this file except in compliance with the License. | ||
* You may obtain a copy of the License at | ||
* | ||
* http://www.apache.org/licenses/LICENSE-2.0 | ||
* | ||
* Unless required by applicable law or agreed to in writing, | ||
* software distributed under the License is distributed on an | ||
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
* KIND, either express or implied. See the License for the | ||
* specific language governing permissions and limitations | ||
* under the License. | ||
*/ | ||
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/* | ||
* Modifications Copyright OpenSearch Contributors. See | ||
* GitHub history for details. | ||
*/ | ||
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package org.opensearch.analysis.common; | ||
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import org.apache.lucene.analysis.TokenFilter; | ||
import org.apache.lucene.analysis.TokenStream; | ||
import org.apache.lucene.analysis.en.EnglishMinimalStemFilter; | ||
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute; | ||
import org.apache.lucene.analysis.tokenattributes.KeywordAttribute; | ||
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import java.io.IOException; | ||
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public final class EnglishPluralStemFilter extends TokenFilter { | ||
private final EnglishPluralStemmer stemmer = new EnglishPluralStemmer(); | ||
private final CharTermAttribute termAtt = addAttribute(CharTermAttribute.class); | ||
private final KeywordAttribute keywordAttr = addAttribute(KeywordAttribute.class); | ||
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public EnglishPluralStemFilter(TokenStream input) { | ||
super(input); | ||
} | ||
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@Override | ||
public boolean incrementToken() throws IOException { | ||
if (input.incrementToken()) { | ||
if (!keywordAttr.isKeyword()) { | ||
final int newlen = stemmer.stem(termAtt.buffer(), termAtt.length()); | ||
termAtt.setLength(newlen); | ||
} | ||
return true; | ||
} else { | ||
return false; | ||
} | ||
} | ||
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/** | ||
* Plural stemmer for English based on the {@link EnglishMinimalStemFilter} | ||
* <p> | ||
* This stemmer removes plurals but beyond EnglishMinimalStemFilter adds | ||
* four new suffix rules to remove dangling e characters: | ||
* <ul> | ||
* <li>xes - "boxes" becomes "box"</li> | ||
* <li>sses - "dresses" becomes "dress"</li> | ||
* <li>shes - "dishes" becomes "dish"</li> | ||
* <li>tches - "watches" becomes "watch"</li> | ||
* </ul> | ||
* See https://github.com/elastic/elasticsearch/issues/42892 | ||
* <p> | ||
* In addition the s stemmer logic is amended so that | ||
* <ul> | ||
* <li>ees->ee so that bees matches bee</li> | ||
* <li>ies->y only on longer words to that ties matches tie</li> | ||
* <li>oes->o rule so that tomatoes matches tomato but retains e for some words eg shoes to shoe</li> | ||
* </ul> | ||
*/ | ||
public static class EnglishPluralStemmer { | ||
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// Words ending in oes that retain the e when stemmed | ||
public static final char[][] oesExceptions = { "shoes".toCharArray(), "canoes".toCharArray(), "oboes".toCharArray() }; | ||
// Words ending in ches that retain the e when stemmed | ||
public static final char[][] chesExceptions = { | ||
"cliches".toCharArray(), | ||
"avalanches".toCharArray(), | ||
"mustaches".toCharArray(), | ||
"moustaches".toCharArray(), | ||
"quiches".toCharArray(), | ||
"headaches".toCharArray(), | ||
"heartaches".toCharArray(), | ||
"porsches".toCharArray(), | ||
"tranches".toCharArray(), | ||
"caches".toCharArray() }; | ||
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@SuppressWarnings("fallthrough") | ||
public int stem(char s[], int len) { | ||
if (len < 3 || s[len - 1] != 's') return len; | ||
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switch (s[len - 2]) { | ||
case 'u': | ||
case 's': | ||
return len; | ||
case 'e': | ||
// Modified ies->y logic from original s-stemmer - only work on strings > 4 | ||
// so spies -> spy still but pies->pie. | ||
// The original code also special-cased aies and eies for no good reason as far as I can tell. | ||
// ( no words of consequence - eg http://www.thefreedictionary.com/words-that-end-in-aies ) | ||
if (len > 4 && s[len - 3] == 'i') { | ||
s[len - 3] = 'y'; | ||
return len - 2; | ||
} | ||
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// Suffix rules to remove any dangling "e" | ||
if (len > 3) { | ||
// xes (but >1 prefix so we can stem "boxes->box" but keep "axes->axe") | ||
if (len > 4 && s[len - 3] == 'x') { | ||
return len - 2; | ||
} | ||
// oes | ||
if (len > 3 && s[len - 3] == 'o') { | ||
if (isException(s, len, oesExceptions)) { | ||
// Only remove the S | ||
return len - 1; | ||
} | ||
// Remove the es | ||
return len - 2; | ||
} | ||
if (len > 4) { | ||
// shes/sses | ||
if (s[len - 4] == 's' && (s[len - 3] == 'h' || s[len - 3] == 's')) { | ||
return len - 2; | ||
} | ||
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// ches | ||
if (len > 4) { | ||
if (s[len - 4] == 'c' && s[len - 3] == 'h') { | ||
if (isException(s, len, chesExceptions)) { | ||
// Only remove the S | ||
return len - 1; | ||
} | ||
// Remove the es | ||
return len - 2; | ||
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} | ||
} | ||
} | ||
} | ||
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default: | ||
return len - 1; | ||
} | ||
} | ||
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private boolean isException(char[] s, int len, char[][] exceptionsList) { | ||
for (char[] oesRule : exceptionsList) { | ||
int rulePos = oesRule.length - 1; | ||
int sPos = len - 1; | ||
boolean matched = true; | ||
while (rulePos >= 0 && sPos >= 0) { | ||
if (oesRule[rulePos] != s[sPos]) { | ||
matched = false; | ||
break; | ||
} | ||
rulePos--; | ||
sPos--; | ||
} | ||
if (matched) { | ||
return true; | ||
} | ||
} | ||
return false; | ||
} | ||
} | ||
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} |
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19 changes: 19 additions & 0 deletions
19
...-api-spec/src/main/resources/rest-api-spec/api/cluster.delete_decommission_awareness.json
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{ | ||
"cluster.delete_decommission_awareness": { | ||
"documentation": { | ||
"url": "https://opensearch.org/docs/latest/opensearch/rest-api/decommission/", | ||
"description": "Delete any existing decommission." | ||
}, | ||
"stability": "experimental", | ||
"url": { | ||
"paths": [ | ||
{ | ||
"path": "/_cluster/decommission/awareness/", | ||
"methods": [ | ||
"DELETE" | ||
] | ||
} | ||
] | ||
} | ||
} | ||
} |
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881333b463d47828eda7443b19811763367b1916 |
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