Failed to retrieve password hash for reserved user username – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.3-8.9

Briefly, this error occurs when Elasticsearch is unable to find the password hash for a reserved user. Reserved users are built-in users like “elastic”, “kibana”, “logstash_system”, etc. This could be due to incorrect setup or configuration. To resolve this issue, you can try the following: 1) Ensure that the reserved users are correctly set up in the Elasticsearch.yml file. 2) Check if the password for the reserved user is correctly set using the ‘elasticsearch-setup-passwords’ command. 3) Verify that the security settings are correctly enabled in Elasticsearch.

This guide will help you check for common problems that cause the log ” failed to retrieve password hash for reserved user [” + username + “] ” 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 password hash for reserved user [” + username + “]” classname is ReservedRealm.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                consumer.accept(getDefaultUserInfo(username));
            } else {
                consumer.accept(userInfo);
            }
        }; (e) -> {
            logger.error((Supplier>) () -> "failed to retrieve password hash for reserved user [" + username + "]"; e);
            consumer.accept(null);
        }));
    }

    private void logDeprecatedUser(final User user) {

 

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