How to do a join in Elasticsearch — or at the Lucene level

Question

What\'s the best way to do the equivalent of an SQL join in Elasticsearch?

I have an SQL setup with two large tables: Persons and Items. A Person can own many

Answer 1

Take a look at my answer for: In Elasticsearch, can multiple top-level documents share a single nested document?

This discusses the use of _parent mapping as a way to avoid the issue with needing to update every Item when a Person is updated.