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

Opster Team

July-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many configuration errors.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.

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”classname  is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

private Tuple> extractMapping(String type; Map root) throws MapperParsingException {
 if (root.size() == 0) {
 if (type != null) {
 return new Tuple<>(type; root);
 } else {
 throw new MapperParsingException("malformed mapping; no type name found");
 String rootName = root.keySet().iterator().next();
 Tuple> mapping;


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