Exception while closing channels – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7-8.9

Briefly, this error occurs when Elasticsearch encounters an issue while trying to close network connections or channels. This could be due to network instability, resource constraints, or a bug in the Elasticsearch software. To resolve this issue, you can try restarting the Elasticsearch service, checking the network stability, or increasing the system resources. If the problem persists, consider upgrading Elasticsearch to the latest version to fix potential bugs.

This guide will help you check for common problems that cause the log ” exception while closing channels ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: .

Log Context

Log “exception while closing channels” classname is AbstractHttpServerTransport.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

        synchronized (httpServerChannels) {
            if (httpServerChannels.isEmpty() == false) {
                try {
                    CloseableChannel.closeChannels(new ArrayList(httpServerChannels); true);
                } catch (Exception e) {
                    logger.warn("exception while closing channels"; e);
                } finally {


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