MapperService INDEX MAPPER DYNAMIC SETTING getKey is false – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7-7.17

Briefly, this error occurs when the dynamic mapping setting in Elasticsearch is set to false. This setting controls whether new fields can be automatically added to the index. If it’s set to false, Elasticsearch will reject documents that have fields not already in the index. To resolve this issue, you can either change the setting to true to allow dynamic mapping, or manually add the new fields to the index mapping before indexing the documents.

This guide will help you check for common problems that cause the log ” [” + MapperService.INDEX_MAPPER_DYNAMIC_SETTING.getKey() + “] is [false] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: .

Log Context

Log “[” + MapperService.INDEX_MAPPER_DYNAMIC_SETTING.getKey() + “] is [false]” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 final AutoCreate autoCreate = this.autoCreate;
 if (autoCreate.autoCreateIndex == false) {
 throw new IndexNotFoundException("[" + AUTO_CREATE_INDEX_SETTING.getKey() + "] is [false]"; index);
 if (dynamicMappingDisabled) {
 throw new IndexNotFoundException("[" + MapperService.INDEX_MAPPER_DYNAMIC_SETTING.getKey() + "] is [false]"; index);
 // matches not set; default value of "true"
 if (autoCreate.expressions.isEmpty()) {
 return true;


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