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

Opster Team

August-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch encounters an unexpected token in the source settings during parsing. This is usually due to a syntax error, such as a missing or misplaced bracket, comma, or quotation mark. To resolve this issue, you should carefully review your source settings for any syntax errors. Ensure that all brackets, commas, and quotation marks are correctly placed. Also, check for any unexpected characters that might have been accidentally included. If the problem persists, consider using a JSON validator to help identify any syntax issues.

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 Elasticsearch concepts: settings, source.

Log Context

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

 } else if (token.isValue()) {
 } else {
 throw new ElasticsearchParseException("unexpected token while parsing source settings");
 }  fetchSourceContext = FetchSourceContext.of(
 fetchSourceContext == null || fetchSourceContext.fetchSource();