The private key uses unsupported key algorithm type – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.7-7.15

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Briefly, this error occurs when Elasticsearch tries to use a private key with an algorithm that it doesn’t support. This could be due to an incorrect configuration or an outdated version of Elasticsearch. To resolve this issue, you can try updating Elasticsearch to the latest version, as newer versions support more algorithms. Alternatively, you can regenerate the private key using a supported algorithm. Lastly, check your Elasticsearch configuration to ensure it’s correctly set up to use the right private key and algorithm.

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This guide will help you check for common problems that cause the log ” The private key uses unsupported key algorithm type [ ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “The private key uses unsupported key algorithm type [” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 if (privateKey == null) {
 throw new ElasticsearchSecurityException("There is no private key available for this credential");
 final String keyType = privateKey.getAlgorithm();
 if (keyType.equals("RSA") == false && keyType.equals("EC") == false) {
 throw new ElasticsearchSecurityException("The private key uses unsupported key algorithm type [" + keyType
 + "]; only RSA and EC are supported");
 }  private static SamlIdentityProvider.OrganizationInfo buildOrganization(Settings settings) {


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