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Span Field Masking Query
editSpan Field Masking Query
editWrapper to allow span queries to participate in composite single-field span queries by lying about their search field. The span field masking query maps to Lucene’s SpanFieldMaskingQuery
This can be used to support queries like span-near
or span-or
across different fields, which is not ordinarily permitted.
Span field masking query is invaluable in conjunction with multi-fields when same content is indexed with multiple analyzers. For instance we could index a field with the standard analyzer which breaks text up into words, and again with the english analyzer which stems words into their root form.
Example:
GET /_search { "query": { "span_near": { "clauses": [ { "span_term": { "text": "quick brown" } }, { "field_masking_span": { "query": { "span_term": { "text.stems": "fox" } }, "field": "text" } } ], "slop": 5, "in_order": false } } }
Note: as span field masking query returns the masked field, scoring will be done using the norms of the field name supplied. This may lead to unexpected scoring behaviour.