Lucene

1. Downloading/Buildng

More info on building here: https://github.com/apache/lucene-solr some versions of elasticsearch use a different version of lucene. Build from a branch that supports your elasticsearch version ex: elastic 6.5 uses lucene 7.5

2. Files

2.1 The ee folder goes here: common/java/org/apache/lucene/analysis

2.2 EstonianStemmer file goes here: common/java/org/tartarus/snowball/ext

2.3 Add the ee folder and put the stopwords file here: common/resources/org/apache/lucene/analysis/ee

2.4 Build lucene

3. After building

Locate the new analyzers jar file. This file will replace the default elasticsearch lucene analyzers jar file later on

Elastic

1. Downloading/Building

More info on building here: https://github.com/elastic/elasticsearch dont forget to choose the correct branch (the one you decided to base your lucene version off of)

2. Adding files/Lines of code

2.1 Add the following code to the path displayed in the picture (middle part of the picture) File: StemmerTokenFilterFactory

import

import org.tartarus.snowball.ext.EstonianStemmer;

Code:

else if ("estonian".equalsIgnoreCase(language)) {
  return new SnowballFilter(tokenStream, new EstonianStemmer());
}

2.2 Add the following code to the path displayed in the picture File: CommonAnalysisPlugin

import

import org.apache.lucene.analysis.ee.EstonianAnalyzer;

2.2.1 Code:

analyzers.put("estonian", EstonianAnalyzerProvider::new);

2.2.2 Code:

analyzers.add(new PreBuiltAnalyzerProviderFactory("estonian", CachingStrategy.LUCENE, EstonianAnalyzer::new));

2.3 Add the following code to the path displayed in the picture File: Analysis

import

import org.apache.lucene.analysis.ee.EstonianAnalyzer;

2.2.2 Code:

namedStopWords.put("_estonian_", EstonianAnalyzer.getDefaultStopSet());

2.4 Add the EstonianAnalyzerProvider.java file

The folder where the file goes

3. Change the default analyzers jar file thats downloaded by gradle

Navigate to you gradle home folder, then navigate to the lucene-analyzers-common folder

My path looks like this on windows: C:\Users\gm\.gradle\caches\modules-2\files-2.1\org.apache.lucene\lucene-analyzers-common\7.5.0

you will probably notice that there are 2 folders here, choose the one without the .sources jar file

so in my case my full path would be e7fbdfc2297c3ff5d194d7bef95810504e52710e\lucene-analyzers-common-7.5.0.jar

replace the jar file there with your custom lucene jar file (just in case change the name aswell)

after replacing the jar file you should be able to build elasticsearch