Statistics summations search returned shard failures – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.2-7.5

Briefly, this error occurs when Elasticsearch encounters issues while aggregating data across multiple shards, possibly due to a network glitch, shard unavailability, or a query execution problem. To resolve this, you can first check the health of your cluster and ensure all shards are allocated. If there are unassigned shards, try to manually assign them. Also, review your query to ensure it’s correctly formatted and doesn’t exceed any limits. If the issue persists, consider increasing the timeout value to allow more time for the query to execute.

This guide will help you check for common problems that cause the log ” statistics summations search returned shard failures: {} ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: search, shard, plugin.

Log Context

Log “statistics summations search returned shard failures: {}” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :


        ActionListener getStatisticSummationsListener = ActionListener.wrap(
            searchResponse -> {
                if (searchResponse.getShardFailures().length > 0) {
                    logger.error("statistics summations search returned shard failures: {}";



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