Unwind
Deconstructs an array type field from the input data and output a document for each element of the array.
When you are working with some specific elements of an array type field, Unwind can make you life easier. It contains two parts:
The field you want to unwind: It must be an array or operators that returns an array.
Whether to include an index: This is optional.
For example you have some data looks like above: The log field contains four elements.
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