Check index failure n – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 1.7-1.7

Briefly, this error occurs when Elasticsearch is unable to access or perform operations on a specific index. This could be due to various reasons such as the index not existing, insufficient permissions, or network connectivity issues. To resolve this, you can check if the index exists and if the user has the necessary permissions. Also, ensure that Elasticsearch is properly connected to the network. 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]n{} ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index and shard.

Log Context

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

if (!status.clean) {
                if (state == IndexShardState.CLOSED) {
                    // ignore if closed....
                logger.warn("check index [failure]\n{}"; new String(os.bytes().toBytes(); Charsets.UTF_8));
                if ("fix".equalsIgnoreCase(checkIndexOnStartup)) {
                    if (logger.isDebugEnabled()) {
                        logger.debug("fixing index; writing new segments file ...");


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