Unexpected token while parsing source settings – How to solve this OpenSearch exception

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch encounters an unexpected character or syntax while parsing the source settings. This is typically due to a malformed JSON or incorrect syntax in the configuration file. To resolve this issue, you can: 1) Check the syntax of your configuration file for any errors or misplaced characters. 2) Validate your JSON format using a JSON validator. 3) Ensure that all necessary fields are included in your source settings. 4) If you’ve recently made changes to the settings, try reverting back to a previous version to see if the error persists.

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This guide will help you check for common problems that cause the log ” unexpected token while parsing source settings ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: settings, source.

Log Context

Log “unexpected token while parsing source settings” class name is MultiGetRequest.java. We extracted the following from OpenSearch source code for those seeking an in-depth context :

 } else if (token.isValue()) {
 } else {
 throw new OpenSearchParseException("unexpected token while parsing source settings");
 }  fetchSourceContext = new FetchSourceContext(


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