No handler for type type declared on field fieldName – How to solve this OpenSearch exception

Opster Team

Aug-23, Version: 1-2.9

Before you dig into reading this guide, have you tried asking OpsGPT what this log means? You’ll receive a customized analysis of your log.

Try OpsGPT now for step-by-step guidance and tailored insights into your OpenSearch operation.

Briefly, this error occurs when OpenSearch encounters a field in the data that is declared with an unknown or unsupported data type. This could be due to a typo in the type name or using a type that is not supported in the current version of OpenSearch. To resolve this issue, you should first check the type declaration for any typos or incorrect syntax. If the syntax is correct, verify that the type is supported in your version of OpenSearch. If it’s not supported, you’ll need to change the type to one that is supported or upgrade your OpenSearch version.

For a complete solution to your to your search operation, try for free AutoOps for Elasticsearch & OpenSearch . With AutoOps and Opster’s proactive support, you don’t have to worry about your search operation – we take charge of it. Get improved performance & stability with less hardware.

This guide will help you check for common problems that cause the log ” No handler for type [” + type + “] declared on field [” + fieldName + “] ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: handler, index.

Log Context

Log “No handler for type [” + type + “] declared on field [” + fieldName + “]” class name is We extracted the following from OpenSearch source code for those seeking an in-depth context :

 }  Mapper.TypeParser typeParser = parserContext.typeParser(type);
 if (typeParser == null) {
 throw new MapperParsingException("No handler for type [" + type + "] declared on field [" + fieldName + "]");
 String[] fieldNameParts = fieldName.split("\.");
 // field name is just "."; which is invalid
 if (fieldNameParts.length < 1) {
 throw new MapperParsingException("Invalid field name " + fieldName);


How helpful was this guide?

We are sorry that this post was not useful for you!

Let us improve this post!

Tell us how we can improve this post?

Get expert answers on Elasticsearch/OpenSearch