Failed to validate access token because the index – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.6-7.6

Briefly, this error occurs when Elasticsearch cannot validate the access token due to issues with the index. This could be due to the index being unavailable, deleted, or corrupted. To resolve this, you can try recreating the index, ensuring the index is available and not corrupted, or checking the access token’s validity. If the issue persists, you may need to check your Elasticsearch configuration or the security settings related to token validation.

This guide will help you check for common problems that cause the log ” failed to validate access token because the index [ ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index and plugin.

Log Context

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

        final SecurityIndexManager tokensIndex = getTokensIndexForVersion(userToken.getVersion());
        if (tokensIndex.indexExists() == false) {
            // index doesn't exist so the token is considered invalid as we cannot verify its validity
            logger.warn("failed to validate access token because the index [" + tokensIndex.aliasName() + "] doesn't exist");
        } else {
            final GetRequest getRequest = client
                    .prepareGet(tokensIndex.aliasName(); SINGLE_MAPPING_NAME; getTokenDocumentId(userToken)).request();
            Consumer onFailure = ex -> listener.onFailure(traceLog("check token state"; userToken.getId(); ex));