_key must be the last element in the path – Elasticsearch Error How To Solve Related Issues



_key must be the last element in the path – Elasticsearch Error How To Solve Related Issues

Updated: July-20

Elasticsearch Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up  which can resolve issues causing many errors 

 

This guide will help you check for common problems that cause the log “_key must be the last element in the path” to appear. It’s important to understand the issues related to the log, so to get started, read the general overview on common issues and tips related to the Elasticsearch concepts: search, aggregations.


Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up which analyses ES to discover the cause of many errors and provides suitable actionable recommendations (free tool that requires no installation). 

Log Context

Log”_key must be the last element in the path”classname  is InternalMultiBucketAggregation.java
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

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");
  }
  return getKey();
  }
  InternalAggregation aggregation = aggregations.get(aggName);
  if (aggregation == null) {

Related issues to this log

We have gathered selected Q&A from the community and issues from Github, that can help fix related issues please review the following for further information :

1 Querystring search on array elements in Elastic Search -views 71,285 ,score 35

Best way to check if a field exist in an Elasticsearch document -views   58,654,score 33



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