Briefly, this error occurs when Elasticsearch is unable to fetch the details of reserved users, which are built-in users like “elastic”, “kibana”, “logstash_system”, etc. This could be due to incorrect configuration or authentication issues. To resolve this, ensure that the reserved users are properly configured in the Elasticsearch.yml file. Also, check if the built-in users are enabled and their passwords are correctly set. If you’re using security features, make sure the Elasticsearch security settings are correctly configured. Lastly, check the Elasticsearch logs for more specific error details.
This guide will help you check for common problems that cause the log ” failed to retrieve reserved users ” 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 retrieve reserved users” classname is ReservedRealm.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :
users.add(anonymousUser);
}
listener.onResponse(users);
}; (e) -> {
logger.error("failed to retrieve reserved users"; e);
listener.onResponse(anonymousEnabled ? Collections.singletonList(anonymousUser) : Collections.emptyList());
}));
}
}
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