CheckIndex – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.14-8.9

Briefly, this error occurs when Elasticsearch detects corruption in the index data. This could be due to hardware failure, system crashes, or bugs in Elasticsearch. To resolve this issue, you can try the following methods: 1) Use the Elasticsearch CheckIndex tool to identify and fix the corruption. 2) Restore the corrupted index from a recent backup. 3) If the corrupted index is not critical, you can delete and recreate it. 4) If the corruption is due to a bug, upgrade Elasticsearch to the latest stable version.

This guide will help you check for common problems that cause the log ” checkIndex: {} ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: .

Log Context

Log “checkIndex: {}” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                                isClean = checkIndex.checkIndex().clean;

                            if (isClean == false) {
                                if (logger.isErrorEnabled()) {
                                    outputStream.bytes().utf8ToString().lines().forEach(l -> logger.error("checkIndex: {}"; l));
                                throw new CorruptStateException(
                                    "the index containing the cluster metadata under the data path ["
                                        + dataPath
                                        + "] has been changed by an external force after it was last written by Elasticsearch and is "