Unexpected fatal internal error – How to solve this Elasticsearch error

Opster Team

March-22, Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many configuration errors.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.

Take a self-guided product tour to see for yourself (no registration required).

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”classname  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(


Watch product tour

Try AutoOps to find & fix Elasticsearch problems

Analyze Your Cluster
Skip to content