{"record":{"id":"026887d12da98c1f","repo":"elastic/elasticsearch","slug":"invalid-side","errorCode":null,"errorMessage":"invalid side: {}","messagePattern":"invalid side: (.+?)","errorType":"validation","errorClass":"IllegalArgumentException","httpStatus":null,"severity":"error","filePath":"modules/analysis-common/src/main/java/org/elasticsearch/analysis/common/EdgeNGramTokenFilterFactory.java","lineNumber":56,"sourceCode":"        super(name);\n        this.minGram = settings.getAsInt(\"min_gram\", 1);\n        this.maxGram = settings.getAsInt(\"max_gram\", 2);\n        if (settings.get(\"side\") != null) {\n            deprecationLogger.critical(\n                DeprecationCategory.ANALYSIS,\n                \"edge_ngram_side_deprecated\",\n                \"The [side] parameter is deprecated and will be removed. Use a [reverse] before and after the [edge_ngram] instead.\"\n            );\n        }\n        this.side = parseSide(settings.get(\"side\", \"front\"));\n        this.preserveOriginal = settings.getAsBoolean(PRESERVE_ORIG_KEY, false);\n    }\n\n    static int parseSide(String side) {\n        return switch (side) {\n            case \"front\" -> SIDE_FRONT;\n            case \"back\" -> SIDE_BACK;\n            default -> throw new IllegalArgumentException(\"invalid side: \" + side);\n        };\n    }\n\n    @Override\n    public TokenStream create(TokenStream tokenStream) {\n        TokenStream result = tokenStream;\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        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        }","sourceCodeStart":38,"sourceCodeEnd":74,"githubUrl":"https://github.com/elastic/elasticsearch/blob/db6a809a667c081ca1dc7500389d26975573215f/modules/analysis-common/src/main/java/org/elasticsearch/analysis/common/EdgeNGramTokenFilterFactory.java#L38-L74","documentation":"Error \"invalid side: {}\" thrown in elastic/elasticsearch.","triggerScenarios":"Thrown at modules/analysis-common/src/main/java/org/elasticsearch/analysis/common/EdgeNGramTokenFilterFactory.java:56 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":[],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"analyzedSha":"db6a809a667c081ca1dc7500389d26975573215f","analyzedAt":"2026-08-12T01:39:14.192Z","schemaVersion":2},"datasetVersion":"2026-08-12T06:17:24.410Z"}