I searched the forum and internet in general, but i couldn't find clear answers about the differences in scoring. And most of the answers are pretty old. I would like to know all the important current differences/comparison between nested and parent-child documents.
What i understood so far 1. parent and child are two different lucene docs (and guaranteed to be in same shard). nested docs are stored as a separate doc using some internal representation and they are also in the same shard as parent doc. 2. using nested document gives significantly better performance compared to parent-child documents. 3. any update to a nested document will trigger the whole parent document to be reindexed, but any update to child will reindex only the child doc 4. when you apply a filter on nested field, the filter will work but all the nested docs will be returned along with the parent (its a feature in progress <https://github.com/elasticsearch/elasticsearch/issues/3022> ). we do not have this problem with parent-child. Questions or need to confirm my understanding 1. using nested documents will let me sort the documents based on fields in the nested documents, on the other hand i cannot sort by fields in child docs. (feature in progress <https://github.com/elasticsearch/elasticsearch/issues/2917>) 2. filtering results based on a field is possible with both nested and parent-child documents I am curious to know other differences from ranking/scoring perspective. I would ideally like to score the parent documents by an aggregate function (sum or avg) of a nested/child field. Any thoughts anyone ? Thanks Srini -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/elasticsearch/8183aa8d-1efc-40e5-8555-120bca8ff426%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
