Expected one of XContentParser Token VALUE BOOLEAN – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.15

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Briefly, this error occurs when Elasticsearch expects a boolean value (true or false) but receives a different data type. This can happen when indexing documents or updating mappings. To resolve this issue, you should check the data you’re trying to index or the mapping you’re trying to update. Ensure that the field in question is correctly set to a boolean value. If you’re using a script or application to generate or transform your data, verify that it’s correctly outputting boolean values.

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This guide will help you check for common problems that cause the log ” Expected one of [” + XContentParser.Token.VALUE_BOOLEAN + “; ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: parser, search.

Log Context

Log “Expected one of [” + XContentParser.Token.VALUE_BOOLEAN + “; ” class name is FetchSourceContext.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 throw new ParsingException(parser.getTokenLocation(); "Unknown key for a " + token + " in [" + currentFieldName + "].";
 } else {
 throw new ParsingException(parser.getTokenLocation(); "Expected one of [" + XContentParser.Token.VALUE_BOOLEAN + "; "
 + XContentParser.Token.START_OBJECT + "] but found [" + token + "]"; parser.getTokenLocation());
 return new FetchSourceContext(fetchSource; includes; excludes);


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