Expected XContentParser Token START ARRAY in – 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 to receive an array but gets a different data type instead. This is usually due to incorrect formatting or structure of the input data. To resolve this issue, you can: 1) Check the structure of your input data and ensure it matches the expected format. 2) Validate your JSON input for any syntax errors. 3) Review your Elasticsearch mappings to ensure they align with the data you’re trying to index.

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

 + XContentParser.Token.VALUE_NUMBER + "] or [" + XContentParser.Token.VALUE_BOOLEAN + "] or ["
 + XContentParser.Token.VALUE_NULL + "] but found [" + token + "] inside search_after.");
 } else {
 throw new ParsingException(parser.getTokenLocation(); "Expected [" + XContentParser.Token.START_ARRAY + "] in ["
 + SEARCH_AFTER.getPreferredName() + "] but found [" + token + "] inside search_after"; parser.getTokenLocation());
 return builder;


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