Cannot add a value for field – 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 ” Cannot add a value for field ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index.

Log Context

Log “Cannot add a value for field [“classname  is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

if (mapper == null || (mapper instanceof ObjectMapper) == false) {
 return null;
 objectMapper = (ObjectMapper)mapper;
 if (objectMapper.nested().isNested()) {
 throw new MapperParsingException("Cannot add a value for field ["
 + fieldName + "] since one of the intermediate objects is mapped as a nested object: ["
 + + "]");
 return objectMapper.getMapper(subfields[subfields.length - 1]);


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