Failed to acquire connection – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.16-8.9

Briefly, this error occurs when Elasticsearch is unable to establish a connection with the target server or node. This could be due to network issues, server downtime, or incorrect configuration settings. To resolve this issue, you can check the network connectivity, ensure the target server is up and running, and verify the configuration settings. Additionally, you can increase the connection timeout or the maximum number of connections allowed in the Elasticsearch settings.

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

Log Context

Log “failed to acquire connection” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 pendingJoinInfo.message = PENDING_JOIN_CONNECT_FAILED;
 final var attempt = new FailedJoinAttempt(
 new ConnectTransportException(destination; "failed to acquire connection"; e)


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