Check index failed – 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 ” check index failed ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: shard and index.

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 “check index failed”classname  is IndexShard.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :

recoveryState.setStage(RecoveryState.Stage.VERIFY_INDEX);
 if (Booleans.isTrue(checkIndexOnStartup) || "checksum".equals(checkIndexOnStartup)) {
 try {
 checkIndex();
 } catch (IOException ex) {
 throw new RecoveryFailedException(recoveryState; "check index failed"; ex);
 }
 }
 } 
 void checkIndex() throws IOException {

 

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