Check index failuren – How to solve related issues

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Check index failuren – How to solve related issues

Opster Team

Feb-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you run Elasticsearch Error 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 failuren ” to appear. It’s important to understand the issues related to the log, so to get started, read the general overview on common issues and tips related to the Elasticsearch concepts: index and shard.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up which analyses ES to pinpoint the cause of many errors and provides suitable actionable recommendations how to resolve them (free tool that requires no installation).

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 ...");


Run the Check-Up to get a customized report like this:

Analyze your cluster