Sampler aggregation must be used with child aggregations. – How to solve this Elasticsearch error

Opster Team

July-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many configuration errors.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.

This guide will help you check for common problems that cause the log ” Sampler aggregation must be used with child aggregations. ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: search and aggregations.

Log Context

Log “Sampler aggregation must be used with child aggregations.”classname  is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 protected LeafBucketCollector getLeafCollector(LeafReaderContext ctx; LeafBucketCollector sub) throws IOException {
 if (bdd == null) {
 throw new AggregationExecutionException("Sampler aggregation must be used with child aggregations.");
 return bdd.getLeafCollector(ctx);


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