Meta must be an object; got – How to solve this Elasticsearch error

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Meta must be an object; got – How to solve this Elasticsearch error

Opster Team

July-20, 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 that cause many errors.

This guide will help you check for common problems that cause the log ” meta must be an object; got ” 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: index.

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 pinpoint the cause of many errors and provides suitable actionable recommendations how to resolve them (free tool that requires no installation).

Log Context

Log”[meta] must be an object; got”classname  is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

if (metaObject == null) {
  // no meta
  if (metaObject instanceof Map == false) {
  throw new MapperParsingException("[meta] must be an object; got " + metaObject.getClass().getSimpleName() +
  "[" + metaObject + "] for field [" + name +"]");
  Map meta = (Map) metaObject;
  if (meta.size() > 5) {


Run the Check-Up to get a customized report like this:

Analyze your cluster