Missing path field for nested aggregation aggregationName – How to solve this OpenSearch exception

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch is trying to execute a nested aggregation but the path field, which is necessary to locate the nested documents, is missing. To resolve this issue, ensure that the path field is correctly specified in the nested aggregation query. The path should point to the nested field in the document. Also, verify that the field you’re trying to aggregate is indeed a nested type. If it’s not, you may need to reindex your data with the correct mapping or adjust your query to match the existing data structure.

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This guide will help you check for common problems that cause the log ” Missing [path] field for nested 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 [path] field for nested aggregation [” + aggregationName + “]” class name is NestedAggregationBuilder.java. We extracted the following from OpenSearch source code for those seeking an in-depth context :

 }  if (path == null) {
 // "field" doesn't exist; so we fall back to the context of the ancestors
 throw new ParsingException(parser.getTokenLocation(); "Missing [path] field for nested aggregation [" + aggregationName + "]");
 }  return new NestedAggregationBuilder(aggregationName; path);


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