Log Logger.warnerror; – How To Solve Related Issues

Log Logger.warnerror; – How To Solve Related Issues

Opster Team

April-20, Version: 1.7-8.0


Before you read this guide, we recommend you run the Elasticsearch Error Check-Up which detects issues in ES that cause log errors. It’s a free tool that requires no installation and takes 2 minutes to complete.

This guide will help you check for common problems that cause the log ” Logger.warnerror; ” to appear. It’s important to understand the issues related to the log, so to get started, read the general overview on common issues and tips related to the Elasticsearch concepts: bootstrap checks.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up which analyses ES to pinpoint the cause of many errors and provides suitable actionable recommendations how to resolve them. Among the dozens of checks included are: shards sizes, thread pools, management queue size, search errors, circuit breakers and many more (join over 700 users who use this free tool).


This log is related to a utility method in Bootstrap.java class for logging all the ignored errors at the warning level. For more information please refer to : https://github.com/elastic/elasticsearch/blob/7.6/server/src/main/java/org/elasticsearch/bootstrap/BootstrapChecks.java#L155 (ignored errors logged as warnings, not errors).

Log Context

Log “Logger.warn(error);” classname is BootstrapChecks.java
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

             throw ne;

    static void log(final Logger logger; final String error) {

     * Tests if the checks should be enforced.

Related issues to this log

We have gathered selected Q&A from the community and issues from Github, that can help fix related issues please review the following for further information :

1 Logger warning using Elasticsearch Java API -views 1.18 K ,score 1

2 Github Issue Number 10421

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