Failed to unmarshall SAML content – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.7-8.9

Briefly, this error occurs when Elasticsearch fails to parse the Security Assertion Markup Language (SAML) content. This could be due to incorrect SAML configuration, invalid SAML response or request, or issues with the SAML Identity Provider (IdP). To resolve this, you can check and correct your SAML configuration in Elasticsearch, ensure the SAML response or request is valid, or troubleshoot issues with your SAML IdP. Additionally, enabling debug logging can help identify the exact cause of the error.

This guide will help you check for common problems that cause the log ” Failed to unmarshall SAML content [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “Failed to unmarshall SAML content [{}]” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 return type.cast(object);
 Object[] args = new Object[] { element.getTagName(); type.getName(); object.getClass().getName() };
 throw new ElasticsearchSecurityException("SAML object [{}] is incorrect type. Expected [{}] but was [{}]"; args);
 } catch (UnmarshallingException e) {
 throw new ElasticsearchSecurityException("Failed to unmarshall SAML content [{}]"; e; element.getTagName());
 }  void print(Element element; Writer writer; boolean pretty) throws TransformerException {
 final Transformer serializer = getHardenedXMLTransformer();