Unexpected fatal internal error – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.12-8.6

Briefly, this error occurs when Elasticsearch encounters an unexpected condition that prevents it from functioning correctly. This could be due to a variety of reasons such as incorrect configurations, insufficient resources, or software bugs. To resolve this issue, you can try the following: 1) Check the Elasticsearch logs for more detailed error messages. 2) Verify your configurations are correct. 3) Ensure that Elasticsearch has sufficient resources (CPU, memory, disk space). 4) Update Elasticsearch to the latest version to fix any potential software bugs.

This guide will help you check for common problems that cause the log ” Unexpected fatal internal error ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: repositories, plugin.

Log Context

Log “Unexpected fatal internal error” class name is EncryptedRepository.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 try {
 computedRepositoryPasswordId = AESKeyUtils.computeId(
 AESKeyUtils.generatePasswordBasedKey(repositoryPassword; masterRepositoryPasswordIdSalt)
 } catch (Exception e) {
 throw new RepositoryException(metadata.name(); "Unexpected fatal internal error"; e);
 if (computedRepositoryPasswordId.equals(masterRepositoryPasswordId)) {
 this.validatedLocalRepositoryPasswordHash = computedRepositoryPasswordId;
 } else {
 throw new RepositoryException(


How helpful was this guide?

We are sorry that this post was not useful for you!

Let us improve this post!

Tell us how we can improve this post?