Refreshing cluster info in background – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.1-7.11

Briefly, this error occurs when Elasticsearch is updating its internal state about the cluster. This is a routine operation and not an error per se. It’s part of Elasticsearch’s self-management to ensure it has the latest information about nodes, indices, and shard locations. However, if this message appears frequently or causes performance issues, it might indicate a problem. To resolve this, you could reduce the frequency of refreshes by adjusting the ‘’ setting, ensure your cluster state is not changing too frequently, or check for network connectivity issues between nodes.

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

Log Context

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


    private void executeRefresh(ClusterState clusterState; String reason) {
        if (clusterState.nodes().getDataNodes().size() > 1) {
            logger.trace("refreshing cluster info in background [{}]"; reason);
            threadPool.executor(REFRESH_EXECUTOR).execute(new RefreshRunnable(reason));



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