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:
response = client.search( body: { query: { span_near: { clauses: [ { span_term: { text: 'quick brown' } }, { span_field_masking: { query: { span_term: { 'text.stems' => 'fox' } }, field: 'text' } } ], slop: 5, in_order: false } } } ) puts response
GET /_search { "query": { "span_near": { "clauses": [ { "span_term": { "text": "quick brown" } }, { "span_field_masking": { "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.