Field masking span must have field set for it – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.14

Briefly, this error occurs when the “field_masking_span” query is used in Elasticsearch without specifying the [field] parameter. This query is used to match spans which are near one another, but the [field] parameter is mandatory to specify the field to be queried. To resolve this issue, ensure that the [field] parameter is included in your query. Also, verify that the field you’re querying exists in your index and that it’s correctly spelled and formatted.

This guide will help you check for common problems that cause the log ” field_masking_span must have [field] set for it ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: query, index.

Log Context

Log “field_masking_span must have [field] set for it” class name is We extracted the following from Elasticsearch 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");
 FieldMaskingSpanQueryBuilder queryBuilder = new FieldMaskingSpanQueryBuilder(inner; field);
 return queryBuilder;


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