Auto expanded replicas to – How to solve related issues

Opster Team

Feb-20, Version: 1.7-8.0

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

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

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 “[{}] auto expanded replicas to [{}]” classname is MetaDataUpdateSettingsService.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 
                updateSettings(updateRequest; new ActionListener() {
                    
Override
                    public void onResponse(ClusterStateUpdateResponse response) {
                        for (String index : indices) {
                            logger.info("[{}] auto expanded replicas to [{}]"; index; fNumberOfReplicas);
                        }
                    }

                    
Override
                    public void onFailure(Throwable t) {


 

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