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

Updated: July-20

Elasticsearch 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 causing 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, 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 discover the cause of many errors and provides suitable actionable recommendations (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());

Related issues to this log

We have gathered selected Q&A from the community and issues from Github, that can help fix related issues please review the following for further information :

1 Elasticsearch aggregation on multiple fields across multiple indexes -views 5,149 ,score 3

Aggregation on different document type -views   413



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