Disconnected during check – How to solve this Elasticsearch error

Opster Team

July-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Check-Up which can resolve issues that cause many errors.

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

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up to analyze Elasticsearch configuration and help resolve this error.

Log Context

Log “disconnected during check”classname  is LeaderChecker.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 if (exp instanceof ConnectTransportException || exp.getCause() instanceof ConnectTransportException) {
 logger.debug(new ParameterizedMessage(
 "leader [{}] disconnected during check"; leader); exp);
 leaderFailed(new ConnectTransportException(leader; "disconnected during check"; exp));
 long failureCount = failureCountSinceLastSuccess.incrementAndGet();
 if (failureCount >= leaderCheckRetryCount) {


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