Could not parse action unexpected string field – 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 string field. This could be due to incorrect data types, syntax errors, or incorrect field names in the request body. To resolve this issue, you should first verify the syntax and structure of your request. Ensure that the field names and data types match what is expected. If the error persists, check your Elasticsearch mappings to ensure they align with the data you’re trying to index. Lastly, consider using a tool to validate your JSON before sending it to Elasticsearch.

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This guide will help you check for common problems that cause the log ” could not parse [{}] action [{}/{}]. unexpected string field [{}] ” 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 string field [{}]” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 "a string value (e.g. 'UTC' or '+01:00')."; TYPE; watchId; currentFieldName);
 } else if (Field.REFRESH.match(currentFieldName; parser.getDeprecationHandler())) {
 refreshPolicy = RefreshPolicy.parse(parser.text());
 } 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);


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