Cache fill failure id – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.3-8.9

Briefly, this error occurs when Elasticsearch fails to load data into the cache due to insufficient memory or a corrupted index. This can lead to slow search performance or even data loss. To resolve this issue, you can increase the heap size to provide more memory for the cache. If the problem persists, consider reindexing your data to fix potential corruption. Also, regularly monitor your cache usage and adjust your cache settings as needed to prevent this error from recurring.

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

Log Context

Log “cache fill failure: [” + id + “]” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                if (submitted == false) {
        } catch (Exception e) {
            logger.warn(() -> "cache fill failure: [" + id + "]"; e);

    protected void innerPut(final IndexRequest request; final ActionListener listener) {


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