Mapping type name is empty – How to solve this OpenSearch exception

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch is trying to create or update an index without a specified mapping type name. Mapping types are essential in OpenSearch as they define how the document and its fields are stored and indexed. To resolve this issue, ensure that you provide a valid mapping type name when creating or updating an index. Also, check your code for any instances where the mapping type might be set to null or an empty string, and correct these. Lastly, ensure that your OpenSearch version supports mapping types, as newer versions have deprecated this feature.

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This guide will help you check for common problems that cause the log ” mapping type name is empty ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: index, mapping.

Log Context

Log “mapping type name is empty” class name is We extracted the following from OpenSearch source code for those seeking an in-depth context :

 return internalMerge(documentMapper; reason);
 }  static void validateTypeName(String type) {
 if (type.length() == 0) {
 throw new InvalidTypeNameException("mapping type name is empty");
 if (type.length() > 255) {
 throw new InvalidTypeNameException(
 "mapping type name [" + type + "] is too long; limit is length 255 but was [" + type.length() + "]"


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