Connection already closed – How to solve this Elasticsearch error

Opster Team

March-22, Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many configuration errors.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.

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

Log Context

Log “connection already closed”classname  is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 public void sendRequest(long requestId; String action; TransportRequest request; TransportRequestOptions options)
 throws IOException; TransportException {
 if (isClosing.get()) {
 throw new NodeNotConnectedException(node; "connection already closed");
 TcpChannel channel = channel(options.type()); 
 // In this is a proxy request; determine whether we want to compress based on the wrapped request
 final TransportRequest wrapped;


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