Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many configuration errors.
Briefly, this error message indicates that the object found at the specified path is not of the nested type, which is a requirement for a nested aggregation. In order for a nested aggregation to be performed, the nested object must be of the nested type. This type is used to indicate that the object is nested within another object. If the object at the specified path is not of the nested type, the aggregation cannot be performed, and this error will be thrown.
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This guide will help you check for common problems that cause the log ” nested nested object under path ” + nestedPath + ” is not of nested type ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: sort and search.
Overview
Search refers to the searching of documents in an index or multiple indices. The simple search is just a GET API request to the _search endpoint. The search query can either be provided in query string or through a request body.
Examples
When looking for any documents in this index, if search parameters are not provided, every document is a hit and by default 10 hits will be returned.
GET my_documents/_search
A JSON object is returned in response to a search query. A 200 response code means the request was completed successfully.
{
"took" : 1,
"timed_out" : false,
"_shards" : {
"total" : 2,
"successful" : 2,
"failed" : 0
},
"hits" : {
"total" : 2,
"max_score" : 1.0,
"hits" : [
...
]
}
}Notes and good things to know
- Distributed search is challenging and every shard of the index needs to be searched for hits, and then those hits are combined into a single sorted list as a final result.
- There are two phases of search: the query phase and the fetch phase.
- In the query phase, the query is executed on each shard locally and top hits are returned to the coordinating node. The coordinating node merges the results and creates a global sorted list.
- In the fetch phase, the coordinating node brings the actual documents for those hit IDs and returns them to the requesting client.
- A coordinating node needs enough memory and CPU in order to handle the fetch phase.
Log Context
Log “[nested] nested object under path [” + nestedPath + “] is not of nested type”classname is SortBuilder.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :
if (nestedObjectMapper == null) {
throw new QueryShardException(context; "[nested] failed to find nested object under path [" + nestedPath + "]");
}
if (nestedObjectMapper.nested().isNested() == false) {
throw new QueryShardException(context; "[nested] nested object under path [" + nestedPath + "] is not of nested type");
}
ObjectMapper objectMapper = context.nestedScope().getObjectMapper();
// get our child query; potentially applying a users filter
Query childQuery;
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