Unexpected token token after fieldName – 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 token after a specific field name during query parsing. This usually happens due to incorrect query syntax or structure. To resolve this issue, you can: 1) Review and correct the query syntax, ensuring it adheres to the Elasticsearch query DSL. 2) Check for any misplaced or missing punctuation in the query. 3) Validate the query using a tool like Kibana’s Dev Tools before executing it.

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This guide will help you check for common problems that cause the log ” unexpected token [” + token + “] after [” + fieldName + “] ” 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 [” + token + “] after [” + fieldName + “]” class name is SuggestBuilder.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 if (suggestionName == null) {
 throw new IllegalArgumentException("suggestion must have name");
 suggestBuilder.addSuggestion(suggestionName; SuggestionBuilder.fromXContent(parser));
 } else {
 throw new ParsingException(parser.getTokenLocation(); "unexpected token [" + token + "] after [" + fieldName + "]");
 return suggestBuilder;


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