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) {
