Merging/Reducing the aggregations failed when computing the aggregation – Elasticsearch Error How To Solve Related Issues

Merging/Reducing the aggregations failed when computing the aggregation – Elasticsearch Error How To Solve Related Issues

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 can resolve issues that cause many errors.

This guide will help you check for common problems that cause the log ” Merging/Reducing the aggregations failed when computing the aggregation ” to appear. It’s important to understand the issues related to the log, so to get started, read the general overview on common issues and tips related to the 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 which analyses ES to pinpoint the cause of many errors and provides suitable actionable recommendations how to resolve them (free tool that requires no installation).

Log Context

Log”Merging/Reducing the aggregations failed when computing the aggregation [“classname  is InternalMappedRareTerms.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :

if (referenceTerms != null &&
  referenceTerms.getClass().equals(terms.getClass()) == false &&
  terms.getClass().equals(UnmappedRareTerms.class) == false) {
  // control gets into this loop when the same field name against which the query is executed
  // is of different types in different indices.
  throw new AggregationExecutionException("Merging/Reducing the aggregations failed when computing the aggregation ["
  + referenceTerms.getName() + "] because the field you gave in the aggregation query existed as two different "
  + "types in two different indices");
  }
  for (B bucket : terms.getBuckets()) {
  List bucketList = buckets.computeIfAbsent(bucket.getKey(); k -> new ArrayList());

 

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