Property null_value cannot be null. – 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.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.

This guide will help you check for common problems that cause the log ” Property null_value cannot be null. ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugins and index.

Log Context

Log “Property [null_value] cannot be null.”classname  is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

String fieldName = entry.getKey();
 Object fieldNode = entry.getValue();
 switch (fieldName) {
 case "null_value":
 if (fieldNode == null) {
 throw new MapperParsingException("Property [null_value] cannot be null.");
 case "ignore_above":


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