Using labels

Labels are used to control the output of the document node.

We can simply define this JSON schema.

[
    {
        "database": "book",
        "index": "book",
        "nodes": {
            "table": "book",
            "columns": [
                "isbn",
                "title"
            ],
            "children": [
                {
                    "table": "author",
                    "label": "authors",
                    "columns": [
                        "name"
                    ]
                }
            ]
        }
    }
]

To get this document structure in Elasticsearch

[
  {
      "isbn": "9785811243570",
      "title": "Charlie and the chocolate factory",
      "authors": ["Roald Dahl"]
  },
  {
      "isbn": "9788374950978",
      "title": "Kafka on the Shore",
      "authors": ["Haruki Murakami", "Philip Gabriel"]
  },
  {
      "isbn": "9781471331435",
      "title": "1984",
      "authors": ["George Orwell"]
  }
]