Count must be the last element in the path – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

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Briefly, this error occurs when the “_count” API is not correctly placed at the end of the Elasticsearch request path. The “_count” API is used to get the number of documents matching a specific query and it must be the last element in the path. To resolve this issue, ensure that “_count” is placed at the end of your request path. For example, instead of “/index/type/_count/_search”, use “/index/type/_search/_count”. Also, ensure that there are no trailing slashes or parameters after “_count”.

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This guide will help you check for common problems that cause the log ” _count must be the last element in the path ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: search, aggregations.

Log Context

Log “_count must be the last element in the path” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 Aggregations aggregations = getAggregations();
 String aggName = path.get(0);
 if (aggName.equals("_count")) {
 if (path.size() > 1) {
 throw new InvalidAggregationPathException("_count must be the last element in the path");
 return getDocCount();
 } else if (aggName.equals("_key")) {
 if (path.size() > 1) {
 throw new InvalidAggregationPathException("_key must be the last element in the path");


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