Failed to validate access token because the index tokensIndex aliasName doesn t exist – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.2-8.9

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Briefly, this error occurs when Elasticsearch tries to validate an access token but fails because the index alias “tokensIndex” does not exist. This could be due to a misconfiguration or a missing step during setup. To resolve this issue, you can create the missing index alias. Alternatively, you can check your Elasticsearch configuration to ensure that the correct index alias is specified. If you’re using a security plugin, ensure it’s properly configured to recognize the “tokensIndex” alias. Lastly, ensure that the Elasticsearch cluster state is healthy and all nodes are properly communicating.

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This guide will help you check for common problems that cause the log ” failed to validate access token because the index [” + tokensIndex.aliasName() + “] doesn’t exist ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin, index.

Log Context

Log “failed to validate access token because the index [” + tokensIndex.aliasName() + “] doesn’t exist” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

        final SecurityIndexManager tokensIndex = getTokensIndexForVersion(userToken.getTransportVersion());
        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(); getTokenDocumentId(userToken)).request();
            Consumer onFailure = ex -> listener.onFailure(traceLog("check token state"; userToken.getId(); ex));


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