Failed to parse node field expected number but found unknown type – How to solve this OpenSearch exception

Opster Team

Aug-23, Version: 2.5-2.9

Before you dig into reading this guide, have you tried asking OpsGPT what this log means? You’ll receive a customized analysis of your log.

Try OpsGPT now for step-by-step guidance and tailored insights into your OpenSearch operation.

Briefly, this error occurs when OpenSearch expects a numeric value in the node field but encounters a different data type. This could be due to incorrect data input or a mismatch in the data type. To resolve this issue, you can: 1) Check the data being inputted to ensure it matches the expected numeric type. 2) Review the field mapping in your index to ensure it’s set to the correct data type. 3) If you’re using a script or automated process to input data, verify that it’s correctly formatted and not introducing non-numeric values.

For a complete solution to your to your search operation, try for free AutoOps for Elasticsearch & OpenSearch . With AutoOps and Opster’s proactive support, you don’t have to worry about your search operation – we take charge of it. Get improved performance & stability with less hardware.

This guide will help you check for common problems that cause the log ” failed to parse node field; expected number but found unknown type ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: node, cluster.

Log Context

Log “failed to parse node field; expected number but found unknown type” class name is We extracted the following from OpenSearch source code for those seeking an in-depth context :

 unassigned_shards = parser.intValue();
 case NODES:
 if (parser.nextToken() != XContentParser.Token.VALUE_NUMBER) {
 throw new OpenSearchParseException("failed to parse node field; expected number but found unknown type");
 nodes = parser.intValue();
 case WEIGHTS:
 if (parser.nextToken() != XContentParser.Token.VALUE_NUMBER) {


How helpful was this guide?

We are sorry that this post was not useful for you!

Let us improve this post!

Tell us how we can improve this post?

Get expert answers on Elasticsearch/OpenSearch