Failed to index audit event authentication failed – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-6.8

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Briefly, this error occurs when Elasticsearch fails to index an audit event, specifically an authentication failure. This could be due to insufficient permissions, incorrect index settings, or network issues. To resolve this, you can check the user’s permissions and ensure they have the right to index. Also, verify the index settings and make sure they are correct. If the issue persists, check the network connectivity between Elasticsearch and the source of the audit events. Lastly, ensure that the Elasticsearch cluster has enough resources to handle the indexing load.

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This guide will help you check for common problems that cause the log ” failed to index audit event: [authentication_failed] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin, index.

Log Context

Log “failed to index audit event: [authentication_failed]” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

        if (events.contains(AUTHENTICATION_FAILED)) {
            try {
                enqueue(message("authentication_failed"; action; (User) null; null; null; indices(message); message);
            } catch (Exception e) {
                logger.warn("failed to index audit event: [authentication_failed]"; e);



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