Field parameter of fetch fields must be provided – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 8.2-8.9

Briefly, this error occurs when the [fetch_fields] parameter in an Elasticsearch query is missing a required [field] parameter. This parameter is necessary to specify which fields should be returned in the response. To resolve this issue, you can either provide the missing [field] parameter in your query or, if you want to fetch all fields, you can use the wildcard character ‘*’. Alternatively, if you don’t need any specific fields, you can remove the [fetch_fields] parameter from your query.

This guide will help you check for common problems that cause the log ” [field] parameter of [fetch_fields] must be provided ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index.

Log Context

Log “[field] parameter of [fetch_fields] must be provided” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 return -> {
 if (v instanceof Map m) {
 final String field = (String) m.get(FieldAndFormat.FIELD_FIELD.getPreferredName());
 final String format = (String) m.get(FieldAndFormat.FORMAT_FIELD.getPreferredName());
 if (field == null) {
 throw new MapperParsingException("[field] parameter of [fetch_fields] must be provided");
 return new FieldAndFormat(field; format);
 } else if (v instanceof String s) {
 return new FieldAndFormat(s; null);
 } else {


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