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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; Mapnode; 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 + "]"); }