Could not parse data attachment unexpected field – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch is unable to parse an attached data field due to an unexpected field. This could be due to incorrect data format, a typo in the field name, or a field that doesn’t exist in the mapping. To resolve this issue, you can: 1) Check the data format and ensure it matches the expected format. 2) Verify the field name in your request and correct any typos. 3) Review your index mapping and ensure the field exists. If not, update your mapping to include the new field.

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

Log Context

Log “could not parse data attachment. unexpected field [{}]” 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 data attachment. unexpected field [{}]"; currentFieldName);
 }  return dataAttachment;


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