Field name multiFieldName which is a multi field of name cannot – How to solve this OpenSearch exception

Opster Team

Aug-23, Version: 1-1.1

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Briefly, this error occurs when OpenSearch tries to index a document with a field that is defined as a multi-field, but the parent field is missing. This could be due to a misconfiguration in the mapping or a missing field in the document. To resolve this, you can either update your document to include the parent field or modify your index mapping to remove the multi-field definition if it’s not needed. Alternatively, you can also use the “ignore_malformed” option to ignore such errors during indexing.

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This guide will help you check for common problems that cause the log ” Field name [” + multiFieldName + “] which is a multi field of [” + name + “] cannot ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: index.

Log Context

Log “Field name [” + multiFieldName + “] which is a multi field of [” + name + “] cannot” class name is We extracted the following from OpenSearch source code for those seeking an in-depth context :

 }  for (Map.Entry multiFieldEntry : multiFieldsPropNodes.entrySet()) {
 String multiFieldName = multiFieldEntry.getKey();
 if (multiFieldName.contains(".")) {
 throw new MapperParsingException("Field name [" + multiFieldName + "] which is a multi field of [" + name + "] cannot" +
 " contain '.'");
 if (!(multiFieldEntry.getValue() instanceof Map)) {
 throw new MapperParsingException("illegal field [" + multiFieldName + "]; only fields can be specified inside fields");


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