Failed to check index – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 1.7-1.7

Briefly, this error occurs when Elasticsearch is unable to verify the status of an index due to issues like insufficient permissions, incorrect index name, or network connectivity problems. To resolve this, ensure that the Elasticsearch process has the necessary permissions to access the index. Also, verify that the index name is correct and the Elasticsearch cluster is accessible. If the issue persists, consider checking the Elasticsearch logs for more detailed error information.

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.

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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