Property value of field name can t be null – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.7-7.9

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Briefly, this error occurs when a field in Elasticsearch is assigned a null value, which is not allowed. Elasticsearch requires all fields to have a value. To resolve this issue, you can either assign a default value to the field when it’s null or ensure that the field always has a value before indexing. Alternatively, you can use the “ignore_malformed” option to ignore such errors, but this might lead to data loss or incorrect data in your index.

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This guide will help you check for common problems that cause the log ” Property [value] of field [” + name + “] can’t be [null]. ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “Property [value] of field [” + name + “] can’t be [null].” class name is ConstantKeywordFieldMapper.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 public Mapper.Builder parse(String name; Map node; ParserContext parserContext) throws MapperParsingException {
 Object value = null;
 if (node.containsKey("value")) {
 value = node.remove("value");
 if (value == null) {
 throw new MapperParsingException("Property [value] of field [" + name + "] can't be [null].");
 }
 if (value instanceof Number == false && value instanceof CharSequence == false) {
 throw new MapperParsingException("Property [value] of field [" + name +
 "] must be a number or a string; but got [" + value + "]");
 }

 

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