Handshake timeout timeout – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

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Briefly, this error occurs when Elasticsearch fails to establish a connection within the specified timeout period. This could be due to network issues, high server load, or incorrect configuration. To resolve this issue, you can increase the handshake timeout value, check your network connectivity, or reduce the server load. Also, ensure that your Elasticsearch configuration is correct, particularly the settings related to networking and cluster nodes.

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

Log Context

Log “handshake_timeout[” + timeout + “]” class name is TransportHandshaker.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 boolean success = false;
 try {
 handshakeRequestSender.sendRequest(node; channel; requestId; REQUEST_HANDSHAKE_VERSION);  threadPool.schedule(
 () -> handler.handleLocalException(new ConnectTransportException(node; "handshake_timeout[" + timeout + "]"));
 success = true;
 } catch (Exception e) {


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