Multisearch in order to use the first query result as parameters to the second query

If I have an index PEOPLE with personid, name, birthday, relation where the relation is a list that contains the personid of the linked person.
How can I use a _msearch to search for a person and get only the documents of the linked person(s)

You can not. Queries submitted through an _msearch request are processed in parallel without interaction or dependencies between them.

What you are looking for is a join which Elasticsearch does not support. You therefore need to use multiple sequential requests.

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Thanks, you just save me a lot of time.

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