elastic/elasticsearch · error · IllegalArgumentException

elision filter requires [articles] or [articles_path] settin

Error message

elision filter requires [articles] or [articles_path] setting

What it means

Error "elision filter requires [articles] or [articles_path] setting" thrown in elastic/elasticsearch.

Source

Thrown at modules/analysis-common/src/main/java/org/elasticsearch/analysis/common/ElisionTokenFilterFactory.java:30

import org.apache.lucene.analysis.CharArraySet;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.util.ElisionFilter;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.env.Environment;
import org.elasticsearch.index.IndexSettings;
import org.elasticsearch.index.analysis.AbstractTokenFilterFactory;
import org.elasticsearch.index.analysis.Analysis;
import org.elasticsearch.index.analysis.NormalizingTokenFilterFactory;

public class ElisionTokenFilterFactory extends AbstractTokenFilterFactory implements NormalizingTokenFilterFactory {

    private final CharArraySet articles;

    ElisionTokenFilterFactory(IndexSettings indexSettings, Environment env, String name, Settings settings) {
        super(name);
        this.articles = Analysis.parseArticles(env, settings);
        if (this.articles == null) {
            throw new IllegalArgumentException("elision filter requires [articles] or [articles_path] setting");
        }
    }

    @Override
    public TokenStream create(TokenStream tokenStream) {
        return new ElisionFilter(tokenStream, articles);
    }

}

View on GitHub (pinned to db6a809a66)

When it happens

Trigger: Thrown at modules/analysis-common/src/main/java/org/elasticsearch/analysis/common/ElisionTokenFilterFactory.java:30 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of elastic/elasticsearch@db6a809a66 (2026-08-12). Data as JSON: /api/errors/e034205e0d1f72de. Report an issue: GitHub.