Property null value cannot be null – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.1

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Briefly, this error occurs when the “null_value” property in Elasticsearch is set to null. This property is used to replace explicit null values, and it cannot be null itself. To resolve this issue, you can either remove the “null_value” property if it’s not needed, or set it to a non-null value. If you’re using dynamic templates, ensure that the “null_value” is correctly set in the template. Also, check your data input to avoid null values where they’re not expected.

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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, index.

Log Context

Log “Property [null_value] cannot be null.” class name 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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