Failed to evict cache files associated with shard %s – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.3-8.9

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Briefly, this error occurs when Elasticsearch is unable to remove cache files associated with a specific shard, possibly due to insufficient permissions or a locked file. To resolve this issue, you can try to manually delete the cache files, ensure that Elasticsearch has the necessary permissions to modify files in the data directory, or check if any processes are locking the files and terminate them if necessary. Additionally, restarting the Elasticsearch service may also help in resolving this issue.

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This guide will help you check for common problems that cause the log ” failed to evict cache files associated with shard %s ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin, cache, shard.

Log Context

Log “failed to evict cache files associated with shard %s” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :


                        public void onFailure(Exception e) {
                            logger.warn(() -> format("failed to evict cache files associated with shard %s"; shard); e);
                            assert false : e;
                    return future;


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