Expected XContentParser Token VALUE STRING or – 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 string value or an end of an object but receives a different data type or an unexpected value. This is often due to incorrect data formatting or structure in the request body. To resolve this issue, you can: 1) Check the JSON structure and ensure it matches the expected format. 2) Validate the data types of the values being passed. 3) Ensure there are no trailing commas or missing brackets in the JSON. 4) If you’re using a script or a tool to generate the request, verify its output.

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This guide will help you check for common problems that cause the log ” Expected [” + XContentParser.Token.VALUE_STRING + “] or [ ” 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 [” + XContentParser.Token.VALUE_STRING + “] or [” class name is SearchAfterBuilder.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 } else if (token == XContentParser.Token.VALUE_BOOLEAN) {
 } else if (token == XContentParser.Token.VALUE_NULL) {
 } else {
 throw new ParsingException(parser.getTokenLocation(); "Expected [" + XContentParser.Token.VALUE_STRING + "] or ["
 + XContentParser.Token.VALUE_NUMBER + "] or [" + XContentParser.Token.VALUE_BOOLEAN + "] or ["
 + XContentParser.Token.VALUE_NULL + "] but found [" + token + "] inside search_after.");
 } else {


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