Closing connection – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.4-8.2

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Briefly, this error occurs when Elasticsearch is unable to maintain a stable connection due to network issues, high load, or configuration problems. To resolve this, you can check your network connectivity and ensure that Elasticsearch is properly configured. Also, monitor the load on your Elasticsearch cluster to prevent it from being overwhelmed. If the issue persists, consider increasing the timeout settings or optimizing your queries to reduce the load on the server.

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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 Elasticsearch concepts: .

Log Context

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

                        ActionListener.wrap(() -> CloseableChannel.closeChannel(channel))
                    closeChannel = false;
            } else if (e instanceof StreamCorruptedException) {
                logger.warn(() -> new ParameterizedMessage("{}; [{}]; closing connection"; e.getMessage(); channel));
            } else if (e instanceof TransportNotReadyException) {
                logger.debug(() -> new ParameterizedMessage("{} on [{}]; closing connection"; e.getMessage(); channel));
            } else {
                logger.warn(() -> new ParameterizedMessage("exception caught on transport layer [{}]; closing connection"; channel); e);


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