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 Check-Up which can resolve issues that cause many errors.

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.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up to analyze Elasticsearch configuration and help resolve this error.

Log Context

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

} 
 @Override
 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);
 } 
 @Override

 

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