{"record":{"id":"ab73a709e8a69956","repo":"elastic/elasticsearch","slug":"token-filter-cannot-be-used-to-parse-synonyms","errorCode":null,"errorMessage":"Token filter [{}] cannot be used to parse synonyms","messagePattern":"Token filter \\[(.+?)\\] cannot be used to parse synonyms","errorType":"validation","errorClass":"IllegalArgumentException","httpStatus":null,"severity":"error","filePath":"modules/analysis-common/src/main/java/org/elasticsearch/analysis/common/EdgeNGramTokenFilterFactory.java","lineNumber":86,"sourceCode":"\n        result = new EdgeNGramTokenFilter(result, minGram, maxGram, preserveOriginal);\n\n        // side=BACK is not supported anymore but applying ReverseStringFilter up-front and after the token filter has the same effect\n        if (side == SIDE_BACK) {\n            result = new ReverseStringFilter(result);\n        }\n\n        return result;\n    }\n\n    @Override\n    public boolean breaksFastVectorHighlighter() {\n        return true;\n    }\n\n    @Override\n    public TokenFilterFactory getSynonymFilter() {\n        throw new IllegalArgumentException(\"Token filter [\" + name() + \"] cannot be used to parse synonyms\");\n    }\n}\n","sourceCodeStart":68,"sourceCodeEnd":89,"githubUrl":"https://github.com/elastic/elasticsearch/blob/db6a809a667c081ca1dc7500389d26975573215f/modules/analysis-common/src/main/java/org/elasticsearch/analysis/common/EdgeNGramTokenFilterFactory.java#L68-L89","documentation":"Error \"Token filter [{}] cannot be used to parse synonyms\" thrown in elastic/elasticsearch.","triggerScenarios":"Thrown at modules/analysis-common/src/main/java/org/elasticsearch/analysis/common/EdgeNGramTokenFilterFactory.java:86 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":[],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"db6a809a667c081ca1dc7500389d26975573215f","analyzedAt":"2026-08-12T01:39:14.192Z","schemaVersion":2},"datasetVersion":"2026-08-13T09:17:06.757Z"}