Failed to parse request – How to solve this OpenSearch exception

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch is unable to understand the request sent to it. This could be due to incorrect syntax, unsupported parameters, or invalid data types in the request. To resolve this issue, you should first verify the syntax of your request. Ensure that all parameters are supported and are in the correct format. If you’re sending data, check that it’s in a format that OpenSearch can understand. If the error persists, consider simplifying your request or breaking it down into smaller parts to isolate the problem.

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This guide will help you check for common problems that cause the log ” failed to parse request ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: rest, request.

Log Context

Log “failed to parse request” class name is We extracted the following from OpenSearch source code for those seeking an in-depth context :

 try {
 XContentBuilder xContentBuilder = XContentBuilder.builder(result.v1().xContent()).map(transformedSource);
 filteredBytes = BytesReference.bytes(xContentBuilder);
 } catch (IOException e) {
 throw new OpenSearchException("failed to parse request"; e);
 return filteredBytes;


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