Malformed mapping no type name found – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch encounters an incorrect or incomplete mapping structure. Mapping defines the data types for fields, and if a type name is missing, Elasticsearch cannot process the data correctly. To resolve this issue, you can review and correct your mapping structure, ensuring that each field has a defined type. Alternatively, you may need to update your Elasticsearch version if it no longer supports types in mapping, as newer versions only allow single-type indices.

This guide will help you check for common problems that cause the log ” malformed mapping; no type name found ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index.

Log Context

Log “malformed mapping; no type name found” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 Mapping parse(@Nullable String type; CompressedXContent source) throws MapperParsingException {
 Objects.requireNonNull(source; "source cannot be null");
 Map mapping = XContentHelper.convertToMap(source.compressedReference(); true; XContentType.JSON).v2();
 if (mapping.isEmpty()) {
 if (type == null) {
 throw new MapperParsingException("malformed mapping; no type name found");
 } else {
 String rootName = mapping.keySet().iterator().next();
 if (type == null || type.equals(rootName) || documentTypeResolver.apply(type).equals(rootName)) {
 type = rootName;


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