Could not parse dynamic attachments failed to parse 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 dynamic attachments due to incorrect formatting or unsupported file types. This could be due to a missing or incorrect mapper-attachments plugin. To resolve this issue, ensure that the mapper-attachments plugin is correctly installed and updated. Also, check the format of the attachments being parsed. They should be base64 encoded and of a supported file type. Lastly, verify the structure of your JSON document, ensuring that the field containing the attachment is correctly formatted.

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

 } else if (XField.TEMPLATE.match(currentFieldName; parser.getDeprecationHandler())) {
 try {
 template = Attachment.Template.parse(parser);
 } catch (ElasticsearchParseException pe) {
 throw new ElasticsearchParseException("could not parse dynamic attachments. failed to parse [{}] field"; pe;
 } else {
 throw new ElasticsearchParseException("could not parse dynamic attachments. unexpected field [{}]"; currentFieldName);


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