How To Solve Issues Related to Log – Unexpected failure during cluster

How To Solve Issues Related to Log – Unexpected failure during cluster

Updated: Dec-19

Elasticsearch Version: 1.7-8.0


Before you begin reading this guide try our beta Elasticsearch Health Check-Up it analyses JSON’s to provide personalized recommendations that can improve your clusters performance.

To troubleshoot log “Unexpected failure during cluster” it’s important to understand a few problems related to Elasticsearch concepts license, task. See bellow important tips and explanations on these concepts

Log Context

Log”Unexpected failure during cluster” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :


    public void onFailure(String source; 
Nullable Exception e) {
        logger.error(new ParameterizedMessage("unexpected failure during [{}]"; source); e);

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 Fail To Assign Shards After Restart  

No Cluster Health With 2 Nodes  

Github Issue Number 19488

About Opster

Opster detects root causes of Elasticsearch problems, provides automated recommendations and can perform various actions to prevent issues and optimize performance

Find Configuration Errors

Analyze Now