nosql - Can I add a calculated boolean column to an Elasticsearch Kibana query from data from another query?

Question

Let's imagine that we have an Elastic index and we want to get all the documents of that index and a calculated field with the result of a filtering a different Elastic index.

I will better explain that in SQL code so even if Elastic is NoSQL, I can share the goal:

select id, name, (id IN (select customer_id from invoices where customer_id = 123)) as hasBought
from customers;

question from:https://stackoverflow.com/questions/66047866/can-i-add-a-calculated-boolean-column-to-an-elasticsearch-kibana-query-from-data

Answer 1

Elasticsearch doesn't support table joining. You'll need to denormalize your data one way or another, even it results in data duplication. That's the "downside" of NoSQL like ES.

Quoting the docs:

Performing full SQL-style joins in a distributed system like Elasticsearch is prohibitively expensive. Instead, Elasticsearch offers two forms of join which are designed to scale horizontally.