Check index failure – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.14-8.9

Briefly, this error occurs when Elasticsearch is unable to access or read an index due to reasons like incorrect index name, corrupted index, insufficient permissions, or network issues. To resolve this, you can verify the index name and its existence, check the health of the index, ensure the user has appropriate permissions, or troubleshoot network connectivity. If the index is corrupted, you may need to restore it from a backup.

This guide will help you check for common problems that cause the log ” check index [failure] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index, shard.

Log Context

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

            IOException corrupt = null;
            final MetadataSnapshot metadata;
            try {
                metadata = snapshotStoreMetadata();
            } catch (IOException e) {
                logger.warn("check index [failure]"; e);
                throw e;
            final List checkedFiles = new ArrayList(metadata.size());
            for (Map.Entry entry : metadata.fileMetadataMap().entrySet()) {
                try {


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