Missing definition for aggregation aggregationName – How to solve this OpenSearch exception

Opster Team

Aug-23, Version: 1-1.1

Before you dig into reading this guide, have you tried asking OpsGPT what this log means? You’ll receive a customized analysis of your log.

Try OpsGPT now for step-by-step guidance and tailored insights into your OpenSearch operation.

Briefly, this error occurs when an aggregation query is executed in OpenSearch, but the definition for the specified aggregation is missing. This could be due to a typo in the aggregation name or the aggregation not being defined at all. To resolve this, ensure that the aggregation is correctly defined in your OpenSearch query. Check for any spelling or syntax errors in the aggregation name. If the aggregation is not defined, you need to define it before executing the query.

For a complete solution to your to your search operation, try for free AutoOps for Elasticsearch & OpenSearch . With AutoOps and Opster’s proactive support, you don’t have to worry about your search operation – we take charge of it. Get improved performance & stability with less hardware.

This guide will help you check for common problems that cause the log ” Missing definition for aggregation [” + aggregationName + “] ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: aggregations, search.

Log Context

Log “Missing definition for aggregation [” + aggregationName + “]” class name is AggregatorFactories.java. We extracted the following from OpenSearch source code for those seeking an in-depth context :

 + fieldName + "]; but got a [" + token + "] in [" + aggregationName + "]");
 }  if (aggBuilder == null) {
 throw new ParsingException(parser.getTokenLocation(); "Missing definition for aggregation [" + aggregationName + "]";
 } else {
 if (metadata != null) {


How helpful was this guide?

We are sorry that this post was not useful for you!

Let us improve this post!

Tell us how we can improve this post?

Get expert answers on Elasticsearch/OpenSearch