should be a hash but was of type: – Elasticsearch Error How To Solve Related Issues

should be a hash but was of type: – 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 “should be a hash but was of type:” 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: .

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”should be a hash but was of type:”classname  is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

public static Map nodeMapValue(Object node; String desc) {
  if (node instanceof Map) {
  return (Map) node;
  } else {
  throw new ElasticsearchParseException(desc + " should be a hash but was of type: " + node.getClass());
  * Returns an array of string value from a node value.

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 :

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