AUTO CREATE INDEX SETTING getKey is false – How to solve this OpenSearch exception

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when the auto_create_index setting in OpenSearch is set to false. This setting controls whether new indices should be automatically created when a document is indexed into a non-existing index. If set to false, indexing a document into a non-existing index will fail. To resolve this issue, you can either manually create the index before indexing documents into it, or you can change the auto_create_index setting to true or to a pattern that matches the index you want to auto-create.

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

Log Context

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

 }  // One volatile read; so that all checks are done against the same instance:
 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"


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