Unexpected token type token – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.16-8.9

Briefly, this error occurs when Elasticsearch encounters an unexpected token type during query parsing. This could be due to a syntax error in the query, such as incorrect use of brackets or operators. To resolve this issue, you should carefully review your query syntax. Ensure that all brackets are correctly paired and operators are used appropriately. Also, check for any misplaced or missing punctuation. If you’re using a complex query, try breaking it down into simpler parts to identify the problematic section.

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

Log Context

Log “unexpected token type [” + token + “]” class name is HighlightField.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 fragments = values.toArray(new Text[values.size()]);
 } else if (token == XContentParser.Token.VALUE_NULL) {
 fragments = null;
 } else {
 throw new ParsingException(parser.getTokenLocation(); "unexpected token type [" + token + "]");
 return new HighlightField(fieldName; fragments);
 }  @Override


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