Cannot parse attachment of type – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

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Briefly, this error occurs when Elasticsearch tries to parse an attachment of an unsupported or unknown type. This could be due to incorrect configuration of the ingest attachment plugin or the file type is not supported. To resolve this issue, ensure that the ingest attachment plugin is correctly installed and configured. Also, verify that the file type of the attachment is supported by the plugin. If the file type is not supported, consider converting it to a supported format before indexing.

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

Log Context

Log “Cannot parse attachment of type [{}]” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 parser.nextToken();  EmailAttachmentParser emailAttachmentParser = parsers.get(currentAttachmentType);
 if (emailAttachmentParser == null) {
 throw new ElasticsearchParseException("Cannot parse attachment of type [{}]"; currentAttachmentType);
 EmailAttachment emailAttachment = emailAttachmentParser.parse(currentFieldName; parser);
 // one further to skip the end_object from the attachment


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