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How do you explain a distinct query in MongoDB?
db.test3.distinct("id", { key:"value"}).explain() Errors with:
explain is not a function (shell) 
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In MongoDB, the distinct() method finds the distinct values for a given field across a single collection and returns the results in an array. It takes three parameters first one is the field for which to return distinct values and the others are optional.
To get unique values and ignore duplicates, use distinct() in MongoDB. The distinct() finds the distinct values for a specified field across a single collection and returns the results in an array.
Find() Method. In MongoDB, find() method is used to select documents in a collection and return a cursor to the selected documents. Cursor means a pointer that points to a document, when we use find() method it returns a pointer on the selected documents and returns one by one.
As of Mongo 3.2, you can do:
db.test3.explain().distinct("id", {key: "value"})
https://docs.mongodb.org/manual/reference/method/db.collection.explain/
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