Meta values can t be null field name – How to solve this OpenSearch exception

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch tries to index a document with a null value in a field that doesn’t allow null values. This could be due to incorrect data input or a misconfigured mapping. To resolve this, you can either ensure that the data being indexed doesn’t contain null values for this field, or you can modify the mapping to allow null values. Alternatively, you can use a script to handle null values during indexing, such as replacing them with a default value.

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This guide will help you check for common problems that cause the log ” [meta] values can’t be null (field [” + name + “]) ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: index.

Log Context

Log “[meta] values can’t be null (field [” + name + “])” class name is We extracted the following from OpenSearch source code for those seeking an in-depth context :

 throw new MapperParsingException(
 "[meta] values can't be longer than 50 chars; but got [" + value + "] for field [" + name + "]"
 } else if (value == null) {
 throw new MapperParsingException("[meta] values can't be null (field [" + name + "])");
 } else {
 throw new MapperParsingException(
 "[meta] values can only be strings; but got "
 + value.getClass().getSimpleName()
 + "["


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