Shard %s failed to populate rollup index – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.4-8.9

Briefly, this error occurs when Elasticsearch fails to populate data into the rollup index from the shards. This could be due to issues like insufficient disk space, network connectivity problems, or incorrect rollup job configurations. To resolve this, you can check and free up disk space, ensure network connectivity between nodes, and verify the rollup job configurations. Also, check the Elasticsearch logs for more specific error details. Restarting the Elasticsearch cluster or reindexing the data might also help in some cases.

This guide will help you check for common problems that cause the log ” Shard [%s] failed to populate rollup index. ” 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 [%s] failed to populate rollup index.” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

            public void afterBulk(long executionId; BulkRequest request; Exception failure) {
                if (failure != null) {
                    long items = request.numberOfActions();
                    logger.error(() -> format("Shard [%s] failed to populate rollup index."; indexShard.shardId()); failure);

                    // cancel rollup task
                    abort = true;