Field masking span must have query span query clause – How to solve this OpenSearch exception

Opster Team

Aug-23, Version: 1-1.2

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 a field masking span query is used in OpenSearch without a span query clause. The field masking span query is used to hide or mask a certain field, but it requires a span query clause to function properly. To resolve this issue, you should ensure that your field masking span query includes a span query clause. This could be a span term, span multi, span first, span near, or span or query. Check your query structure and make sure it adheres to the correct syntax.

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 ” field_masking_span must have [query] span query clause ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: query, index.

Log Context

Log “field_masking_span must have [query] span query clause” class name is We extracted the following from OpenSearch source code for those seeking an in-depth context :

 if (inner == null) {
 throw new ParsingException(parser.getTokenLocation(); "field_masking_span must have [query] span query clause");
 if (field == null) {
 throw new ParsingException(parser.getTokenLocation(); "field_masking_span must have [field] set for it");


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