PropName must not have a null value – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8

Briefly, this error occurs when a property (propName) in Elasticsearch is assigned a null value, which is not allowed. To resolve this issue, ensure that the property is assigned a valid non-null value before indexing. If the property is not mandatory, you can either remove it from the document or use the “null_value” parameter to replace nulls with a default value. Also, check your data source to prevent null values from being sent to Elasticsearch.

This guide will help you check for common problems that cause the log ” [” + propName + “] must not have a [null] value ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index.

Log Context

Log “[” + propName + “] must not have a [null] value” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 if (false == propName.equals("null_value") && propNode == null) {
 * No properties *except* null_value are allowed to have null. So we catch it here and tell the user something useful rather
 * than send them a null pointer exception later.
 throw new MapperParsingException("[" + propName + "] must not have a [null] value");
 }  /**
 * Parse the {@code meta} key of the mapping.


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