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 Error Check-Up which analyzes 2 JSON files to detect many configuration errors.

Briefly, this error occurs when Elasticsearch is unable to perform a health check on an index. The health check is used to determine the health status of an index and can be used to diagnose problems with the index. This error can occur for a variety of reasons, including network connectivity issues, server load issues, or problems with the index itself. To resolve this issue, you should check the Elasticsearch logs for more information and try to diagnose the underlying cause of the health check failure.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.

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.

Log Context

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

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


See how you can use AutoOps to resolve issues

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