For this query { "firstname" : "George" }, gives invalid output documents:

Question

For this query { "firstname" : "George" }, gives  invalid  output documents:

Answer

{ "_id" : 1, "firstname": ["George", "Junior"], "lastname" : "Lucas"}

Answer

{ "_id" : 1, "identity": {"firstname": "George", "lastname" : "Lucas"}}

Answer

{ "_id" : 1, "firstname": "George", "lastname" : "Lucas"}

Answer

{ "_id" : 1, "firstname": "george", "lastname" : {"name" : "Lucas"}}

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