Reverse_nested nested path ” + path + ” is not nested – 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 ” reverse_nested nested path ” + path + ” is not nested ” 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 “[reverse_nested] nested path [” + path + “] is not nested”classname  is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

parentObjectMapper = queryShardContext.getObjectMapper(path);
 if (parentObjectMapper == null) {
 return new ReverseNestedAggregatorFactory(name; true; null; queryShardContext; parent; subFactoriesBuilder; metadata);
 if (parentObjectMapper.nested().isNested() == false) {
 throw new AggregationExecutionException("[reverse_nested] nested path [" + path + "] is not nested");
 NestedScope nestedScope = queryShardContext.nestedScope();
 try {


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