Failed to check index – 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 ” Failed to check index ” to appear. To understand the issues related to this log, read the explanation below about the following 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 to analyze Elasticsearch configuration and help resolve this error.

Log Context

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

                     logger.debug("check index [success]\n{}"; new String(os.bytes().toBytes(); Charsets.UTF_8));
            recoveryState.getStart().checkIndexTime(Math.max(0; TimeValue.nsecToMSec(System.nanoTime() - timeNS)));
        } catch (Exception e) {
            logger.warn("failed to check index"; e);

    public Engine engine() {
        Engine engine = engineUnsafe();


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