Clear SC failed on node node – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.3-8.9

Briefly, this error occurs when Elasticsearch attempts to clear the search context on a specific node but fails. This could be due to a variety of reasons such as network issues, node unavailability, or insufficient resources. To resolve this issue, you can try the following: 1) Check the health and availability of the node, 2) Ensure the node has sufficient resources (CPU, memory, disk space), 3) Check network connectivity between the nodes, and 4) Review Elasticsearch logs for more detailed error information.

This guide will help you check for common problems that cause the log ” Clear SC failed on node[” + node + “] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: search, node.

Log Context

Log “Clear SC failed on node[” + node + “]” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :


    private void onFailedFreedContext(Throwable e; DiscoveryNode node) {
        logger.warn(() -> "Clear SC failed on node[" + node + "]"; e);

    private void finish() {
        listener.onResponse(new ClearScrollResponse(hasFailed.get() == false; freedSearchContexts.get()));


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