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 begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up  which can resolve issues causing many log errors (free and no installation required)


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 discover the cause of many errors and provides suitable actionable recommendations. 


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.

Find Configuration Errors

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