Completion field type must be indexed – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.9-7.9

Briefly, this error occurs when a completion field in Elasticsearch is not indexed. The completion field type is used for auto-complete suggestions and must be indexed to function properly. To resolve this issue, you can ensure that the completion field is set to be indexed during the mapping process. This can be done by setting “index”: true in the mapping definition for the completion field. Alternatively, you can reindex your data with the correct mapping if it’s already been indexed incorrectly.

This guide will help you check for common problems that cause the log ” Completion field type must be indexed ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index.

Log Context

Log “Completion field type must be indexed” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 }  @Override
 public Builder index(boolean index) {
 if (index == false) {
 throw new MapperParsingException("Completion field type must be indexed");
 return builder;


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