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 analyzes 2 JSON files to detect many configuration errors.

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This guide will help you check for common problems that cause the log ” meta must be an object; got ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index.

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) {


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