Clearing the cache for – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.15

Briefly, this error occurs when Elasticsearch is trying to clear the cache for a specific index but encounters an issue. This could be due to a variety of reasons such as insufficient permissions, a non-existent index, or a network connectivity issue. To resolve this, you can check if the index exists and if you have the necessary permissions. If the index does exist and you have the necessary permissions, you can try restarting Elasticsearch or checking your network connection.

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

Log Context

Log “clearing the cache for [” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 }  @Override
 public void onFailure(Exception e) {
 logger.error(new ParameterizedMessage("unable to clear realm cache for user [{}]"; username); e);
 ElasticsearchException exception = new ElasticsearchException("clearing the cache for [" + username
 + "] failed. please clear the realm cache manually"; e);
 }; securityClient::clearRealmCache);


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