MongoDB : Older records of Mongo DB collection doesn't got necessary keys in them

MongoDB : Older records of Mongo DB collection doesn't got necessary keys
in them

References

Reference NO 1

http://stackoverflow.com/questions/15185321/mongodb-older-records-of-mongo-db-collection-doesnt-got-necessary-keys-in-the

Reference NO 2

http://stackoverflow.com/questions/15165226/mongodb-how-to-make-a-query-within-array-structured-collection

Reference NO 3

http://api.mongodb.org/java/current/com/mongodb/DBCollection.html

Reference NO 4

http://api.mongodb.org/ruby/current/Mongo/Collection.html

Reference NO 5

http://rsmith.co/2012/11/05/mongodb-gotchas-and-how-to-avoid-them/

Reference NO 6

http://snmaynard.com/2012/10/17/things-i-wish-i-knew-about-mongodb-a-year-ago/

Reference NO 7

http://camel.apache.org/mongodb.html

Reference NO 8

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