SLM operation mode updated to – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.16-8.9

Briefly, this error occurs when the Snapshot Lifecycle Management (SLM) operation mode in Elasticsearch is updated. This could be due to a manual update or an automatic update triggered by a system event. To resolve this issue, you can check the current SLM operation mode and ensure it’s set to the desired state. If it’s not, you can manually update it. Also, check for any system events that could have triggered the change and address them accordingly. Lastly, ensure that your Elasticsearch cluster is healthy and functioning properly.

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

Log Context

Log “SLM operation mode updated to {}” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

    public void clusterStateProcessed(ClusterState oldState; ClusterState newState) {
        if (ilmMode != null) {
  "ILM operation mode updated to {}"; ilmMode);
        if (slmMode != null) {
  "SLM operation mode updated to {}"; slmMode);

    public int hashCode() {


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