Failed to create aggregators – 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 ” Failed to create aggregators ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: search.

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 “Failed to create aggregators”classname  is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

if (source.aggregations() != null) {
 try {
 AggregatorFactories factories = source.aggregations().build(queryShardContext; null);
 context.aggregations(new SearchContextAggregations(factories; multiBucketConsumerService.create()));
 } catch (IOException e) {
 throw new AggregationInitializationException("Failed to create aggregators"; e);
 if (source.suggest() != null) {
 try {


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