No handler for type ” + type + ” declared on field ” + fieldName + ” – 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.

Briefly, this error occurs when Elasticsearch encounters a field in an index that has an unsupported data type. This can happen when you try to index a document with a field that has an unsupported data type. To resolve this issue, you should check the field mapping and ensure that the data type of the field is supported by Elasticsearch.

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 ” 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 Elasticsearch concepts: handler and index.

Log Context

Log “No handler for type [” + type + “] declared on field [” + fieldName + “]”classname  is We extracted the following from Elasticsearch 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("\.");
 String realFieldName = fieldNameParts[fieldNameParts.length - 1];
 Mapper.Builder fieldBuilder = typeParser.parse(realFieldName; propNode; parserContext);
 for (int i = fieldNameParts.length - 2; i >= 0; --i) {


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