Unable to clear API key cache – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.1-8.5

Briefly, this error occurs when Elasticsearch fails to clear the API key cache due to insufficient permissions or a misconfigured system. This could be due to the user not having the necessary privileges or the system not being able to access the cache. To resolve this issue, you can check the user’s permissions and ensure they have the necessary rights to clear the cache. Alternatively, you can check the system configuration and ensure it is set up correctly to access and clear the cache.

This guide will help you check for common problems that cause the log ” unable to clear API key cache [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: cache, plugin.

Log Context

Log “unable to clear API key cache [{}]” classname is ApiKeyService.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :


            public void onFailure(Exception e) {
                logger.error(() -> format("unable to clear API key cache [{}]"; clearApiKeyCacheRequest.cacheName()); e);
                listener.onFailure(new ElasticsearchException("clearing the API key cache failed; please clear the caches manually"; e));


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