Unexpected token token expected - How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.17

Briefly, this error occurs when Elasticsearch encounters an unexpected token in the request body. This could be due to a syntax error, incorrect formatting, or an unsupported character. To resolve this issue, you should first check the request body for any syntax errors or unsupported characters. Ensure that the request body is correctly formatted as per Elasticsearch’s requirements. If the error persists, try to isolate the problematic part of the request by removing sections of it until the error no longer occurs. This will help you identify the exact cause of the error.

This guide will help you check for common problems that cause the log ” unexpected token [” + token + “]; expected [; ; {] " to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: .

Log Context

Log "unexpected token [" + token + "]; expected [; ; {]" class name is ScriptMetadata.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 id = null;  break;
 throw new ParsingException(parser.getTokenLocation(); "unexpected token [" + token + "]; expected [; ; {]");
 }  token = parser.nextToken();


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