Failed to get access token because index is not available – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.2-8.9

Briefly, this error occurs when Elasticsearch tries to retrieve an access token from an index that is not available or does not exist. This could be due to the index being deleted, not yet created, or a network issue preventing access. To resolve this, ensure the index exists and is accessible. If it doesn’t exist, create it. If it’s a network issue, check your network settings and connectivity. Also, verify your access token retrieval code for any errors. Lastly, ensure your Elasticsearch cluster is healthy and functioning properly.

This guide will help you check for common problems that cause the log ” failed to get access token [{}] because index [{}] is not available ” 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 get access token [{}] because index [{}] is not available” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

    private void getUserTokenFromId(String userTokenId; TransportVersion tokenVersion; ActionListener listener) {
        final SecurityIndexManager tokensIndex = getTokensIndexForVersion(tokenVersion);
        final SecurityIndexManager frozenTokensIndex = tokensIndex.freeze();
        if (frozenTokensIndex.isAvailable() == false) {
            logger.warn("failed to get access token [{}] because index [{}] is not available"; userTokenId; tokensIndex.aliasName());
        } else {
            final GetRequest getRequest = client.prepareGet(tokensIndex.aliasName(); getTokenDocumentId(userTokenId)).request();
            final Consumer onFailure = ex -> listener.onFailure(traceLog("get token from id"; userTokenId; ex));


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