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

Opster Team

August-23, Version: 6.8-7.14

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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.

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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 FieldMaskingSpanQueryBuilder.java. 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);
 queryBuilder.boost(boost);
 queryBuilder.queryName(queryName);
 return queryBuilder;

 

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