Solr documents with child elements?

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As of Solr 4.7 and 4.8, Solr supports nested documents:

{
"id": "chapter1",
"title" : "Indexing Child Documents in JSON",
"content_type": "chapter",
"_childDocuments_": [
  {
    "id": "1-1",
    "content_type": "page",
    "text": "ho hum... this is page 1 of chapter 1"
  },
  {
    "id": "1-2",
    "content_type": "page",
    "text": "more text... this is page 2 of chapter 1"
  }
]
}

See the Solr release notes for more.

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