Closing connection – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch encounters an issue with a connection, often due to network instability, incorrect configuration, or a problem with the node it’s trying to connect to. To resolve this, you can check your network connection and ensure it’s stable. Also, verify your OpenSearch configuration settings for any errors. If the problem persists, investigate the health and status of the node you’re trying to connect to. It might be overloaded, down, or experiencing other issues that need to be addressed.

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This guide will help you check for common problems that cause the log ” {}; [{}]; closing connection ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: .

Log Context

Log “{}; [{}]; closing connection” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

            if (channel.isOpen()) {
                BytesArray message = new BytesArray(e.getMessage().getBytes(StandardCharsets.UTF_8));
                outboundHandler.sendBytes(channel; message; ActionListener.wrap(() -> CloseableChannel.closeChannel(channel)));
        } else if (e instanceof StreamCorruptedException) {
            logger.warn(() -> new ParameterizedMessage("{}; [{}]; closing connection"; e.getMessage(); channel));
        } else {
            logger.warn(() -> new ParameterizedMessage("exception caught on transport layer [{}]; closing connection"; channel); e);
            // close the channel; which will cause a node to be disconnected if relevant


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