[JIRA] (HSEARCH-3955) Object fields that are both nested and flattened (ES's include_in_parent)
by Yoann Rodière (JIRA)
Yoann Rodière ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) *created* an issue
Hibernate Search ( https://hibernate.atlassian.net/browse/HSEARCH?atlOrigin=eyJpIjoiOGRlOGY5... ) / Improvement ( https://hibernate.atlassian.net/browse/HSEARCH-3955?atlOrigin=eyJpIjoiOGR... ) HSEARCH-3955 ( https://hibernate.atlassian.net/browse/HSEARCH-3955?atlOrigin=eyJpIjoiOGR... ) Object fields that are both nested and flattened (ES's include_in_parent) ( https://hibernate.atlassian.net/browse/HSEARCH-3955?atlOrigin=eyJpIjoiOGR... )
Issue Type: Improvement Assignee: Unassigned Components: backend-elasticsearch, backend-lucene, engine Created: 18/Jun/2020 23:38 PM Fix Versions: 6.x-backlog Priority: Major Reporter: Yoann Rodière ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... )
While nested documents provide additional features, we don't needed nested documents for *everything*. Predicates on a single field when we're not using the nested predicate, in particular, work perfectly well on flattened object fields, and actually perform better since we don't need a runtime join.
To get the best of both worlds, when one can spare the extra disk space it requires, we could allow object fields to be stored *both* as a nested document and flattened in their parent. Elasticsearch allows that with the attribute include_in_parent (see https://www.elastic.co/guide/en/elasticsearch/reference/current/nested.ht... ).
API-wise, this could just be an additional value for the ObjectStructure enum: ObjectStructure.NESTED_AND_FLATTENED. We could then take advantage of this internally: when nesting is not necessary (no nested predicate, no filter in sorts and aggregations), we can just use the flattened field.
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5 years, 9 months