Shard failed to populate rollup index Failures – 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 fails to populate a rollup index due to issues like insufficient disk space, incorrect index settings, or network connectivity problems. To resolve this, you can check if there’s enough disk space and increase it if necessary. Also, verify the index settings and adjust them appropriately. Lastly, ensure that there’s stable network connectivity. If the problem persists, consider reindexing your data.

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This guide will help you check for common problems that cause the log ” Shard [{}] failed to populate rollup index. Failures: [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin, index, shard.

Log Context

Log “Shard [{}] failed to populate rollup index. Failures: [{}]” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                                (msg1; msg2) -> Objects.equals(msg1; msg2) ? msg1 : msg1 + ";" + msg2
                    logger.error("Shard [{}] failed to populate rollup index. Failures: [{}]"; indexShard.shardId(); failures);

                    // cancel rollup task
                    abort = true;


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