Missing suggestion object – How to solve this OpenSearch exception

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when a search query is made with the suggest API in OpenSearch, but the suggestion object is not included in the request. The suggestion object is crucial as it defines the suggestion criteria. To resolve this, ensure that your request includes a valid suggestion object. Check your syntax and structure of the request to ensure it’s correct. Also, verify that the fields you’re suggesting on are correctly indexed and mapped in your OpenSearch index.

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This guide will help you check for common problems that cause the log ” missing suggestion object ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: search.

Log Context

Log “missing suggestion object” class name is SuggestionBuilder.java. We extracted the following from OpenSearch source code for those seeking an in-depth context :

 } else if (token == XContentParser.Token.START_OBJECT) {
 suggestionBuilder = parser.namedObject(SuggestionBuilder.class; currentFieldName; null);
 if (suggestionBuilder == null) {
 throw new OpenSearchParseException("missing suggestion object");
 if (suggestText != null) {
 if (prefix != null) {


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