Added user – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8.9

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Briefly, this error occurs when a new user is added to Elasticsearch. This is not necessarily an error, but more of a confirmation message. However, if this message is unexpected, it could indicate unauthorized changes to your Elasticsearch cluster. To resolve this, you can check the user access logs to identify who made the changes. If the changes were unauthorized, you should immediately revoke the new user’s access and update your security settings to prevent future unauthorized access. Additionally, regularly auditing your user list can help detect any unauthorized changes.

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This guide will help you check for common problems that cause the log ” added user [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “added user [{}]” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

        } else {
            usersStore.putUser(request; new ActionListener() {
                public void onResponse(Boolean created) {
                    if (created) {
              "added user [{}]"; request.username());
                    } else {
              "updated user [{}]"; request.username());
                    listener.onResponse(new PutUserResponse(created));


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