Lucene & Solr 4.9 were released a couple weeks ago and introduced a new result document transformer called ChildDocTransformerFactory.
The ChildDocTransformerFactory transformer is useful when we need to get child documents that were indexed as nested documents.
There are many use cases where we want to 'join' results into a single response where this transformer can help.
Read full article from Using Solr 4.9 new ChildDocTransformerFactory | Javalobby
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