Error while processing ack for node – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-7.17

Briefly, this error occurs when Elasticsearch encounters an issue while acknowledging a node during a cluster update or data replication process. This could be due to network issues, node failure, or a problem with the cluster state. To resolve this, you can try restarting the problematic node, checking the network connectivity between nodes, or increasing the timeout settings for cluster communication. If the problem persists, consider checking the cluster’s health and logs for more specific issues.

This guide will help you check for common problems that cause the log ” error while processing ack for node [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: node, discovery.

Log Context

Log “error while processing ack for node [{}]” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

    private void onNodeAck(final Discovery.AckListener ackListener; DiscoveryNode node; Exception e) {
        try {
            ackListener.onNodeAck(node; e);
        } catch (Exception inner) {
            logger.debug(() -> new ParameterizedMessage("error while processing ack for node [{}]"; node); inner);


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