Unknown field found – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch encounters a field in the document that is not defined in the index mapping. This could be due to a typo in the field name or an attempt to index a document with a new field without updating the mapping. To resolve this issue, you can either correct the field name in your document if it’s a typo, or update the index mapping to include the new field before indexing the document. Alternatively, you can set “dynamic”: “true” in your index settings to automatically add new fields to the mapping.

This guide will help you check for common problems that cause the log ” unknown field found ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: .

Log Context

Log “unknown field found” class name is XContentParserUtils.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 throw new ParsingException(parser.getTokenLocation(); String.format(Locale.ROOT; message; fieldName; currentName));
 }  /**
 * @throws ParsingException with a "unknown field found" reason
 public static void throwUnknownField(String field; XContentParser parser) {
 String message = "Failed to parse object: unknown field [%s] found";
 throw new ParsingException(parser.getTokenLocation(); String.format(Locale.ROOT; message; field));


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