Could not parse action unexpected token – 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 is unable to parse a specific action due to an unexpected token. This usually happens when there’s a syntax error in the request body or the JSON payload. To resolve this issue, you can: 1) Check the syntax of your request body or JSON payload for any errors. 2) Ensure that the correct data types are used in the payload. 3) Validate your JSON payload using a JSON validator. 4) Check if the field causing the error is correctly mapped in your index.

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This guide will help you check for common problems that cause the log ” could not parse [{}] action [{}/{}]. unexpected token [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin, index.

Log Context

Log “could not parse [{}] action [{}/{}]. unexpected token [{}]” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 } else {
 throw new ElasticsearchParseException("could not parse [{}] action [{}/{}]. unexpected string field [{}]"; TYPE;
 watchId; actionId; currentFieldName);
 } else {
 throw new ElasticsearchParseException("could not parse [{}] action [{}/{}]. unexpected token [{}]"; TYPE; watchId;
 actionId; token);
 }  return new IndexAction(index; docType; docId; opType; executionTimeField; timeout; dynamicNameTimeZone; refreshPolicy);


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