Cannot add a value for field – How to solve this Elasticsearch error

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 can resolve issues that cause many errors.

This guide will help you check for common problems that cause the log ” Cannot add a value for field ” to appear. It’s important to understand the issues related to the log, so to get started, read the general overview on common issues and tips related to the Elasticsearch concepts: index.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up which analyses ES to pinpoint the cause of many errors and provides suitable actionable recommendations how to resolve them (free tool that requires no installation).

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]);


Run the Check-Up to get a customized report like this:

Analyze your cluster