Learning Elasticsearch

Parent-child document relation

For parent-child document relations, the relationship between two different document types is set by specifying the parent ID while indexing the child documents. Parent and child document types are separate documents, both accessible using their IDs. We index both the documents like any other regular documents, but when indexing the child document, the parent ID is required. It is a one-to-many relationship. A parent document can have multiple child documents, but a child document can only have one parent document.

You should consider using parent-child document relations in the following cases:

• Updates to parent and child documents are independent. For example, a new comment can be added without updating the ...