Unknown token found – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

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Briefly, this error occurs when Elasticsearch encounters an unexpected or unrecognized token in a query or configuration file. This could be due to a syntax error, incorrect formatting, or unsupported characters. To resolve this issue, you should first check the query or configuration file for any obvious syntax errors or unsupported characters. If nothing stands out, try running the query or configuration file through a JSON validator to identify any hidden issues. If all else fails, revert to a previous version of the query or configuration file that you know worked correctly.

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

Log Context

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

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

 

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