Successfully removed all decommissioned nodes from the cluster – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 2.4-2.9

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Briefly, this error occurs when OpenSearch successfully removes all nodes that have been decommissioned or marked for removal from the cluster. This is not an error but an informational message indicating a successful operation. However, if this operation was not intended, it could lead to data loss or reduced cluster capacity. To resolve this, ensure that nodes are not decommissioned unintentionally. Regularly monitor your cluster’s health and capacity. If nodes were removed unintentionally, you may need to add new nodes to the cluster to maintain its performance and reliability.

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This guide will help you check for common problems that cause the log ” successfully removed all decommissioned nodes [{}] from the cluster ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: cluster.

Log Context

Log “successfully removed all decommissioned nodes [{}] from the cluster” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

        final ClusterStateObserver observer = new ClusterStateObserver(clusterService; timeout; logger; threadPool.getThreadContext());

        final ClusterStateObserver.Listener removalListener = new ClusterStateObserver.Listener() {
            public void onNewClusterState(ClusterState state) {
      "successfully removed all decommissioned nodes [{}] from the cluster"; nodesToBeDecommissioned.toString());

            public void onClusterServiceClose() {


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