Failed to parse query type unknown type – How to solve this OpenSearch exception

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch encounters a query type that it doesn’t recognize or understand. This could be due to a typo, incorrect syntax, or use of a feature not supported by your current version of OpenSearch. To resolve this issue, you should first verify the query type you’re using is correct and supported. If it is, check your syntax to ensure it’s properly formatted. If the error persists, consider upgrading your OpenSearch version to one that supports the query type you’re trying to use.

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This guide will help you check for common problems that cause the log ” failed to parse [{}] query type [{}]. unknown type. ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: index, query.

Log Context

Log “failed to parse [{}] query type [{}]. unknown type.” class name is We extracted the following from OpenSearch source code for those seeking an in-depth context :

 type = t;
 if (type == null) {
 throw new OpenSearchParseException("failed to parse [{}] query type [{}]. unknown type."; NAME; value);
 return type;
 }  public static Type readFromStream(StreamInput in) throws IOException {


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