Parent-Child Relationship

  • Similar in nature to the nested model: both allow you to associate one entity with another
  • Parent-Child linked documents will be stored in the same shard, possible trouble with data distribution
  • With nested datatype all data lives within the scope of parent document
  • With parent-child: parent and each child are indexed separately
  • Children can be queried, updated, and deleted separately from the parent and from each other
  • With large number of child documents parent-child indexing is more effective
  • Child documents can be incorporated into query criteria and into the query results
  • Parent-Child maps are stored in so called doc values quick in-memory processing and scalable split on disk
  • There are still performance concerns voiced in Elastic documentation

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