MongoDB Error Code 11000

Duplicate Key Error: This occurs when an attempt is made to insert a document with a key that already exists in a collection with a unique index.
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What is

MongoDB Error Code 11000

 ?

['Identify the unique index causing the error using: `db.collection.getIndexes()`.', 'Check the document that caused the error and identify the duplicate field.', 'Remove or update the duplicate document if necessary using: `db.collection.updateOne({}, {$set: {: }})`.', 'If duplicates are not needed, consider removing the unique constraint if appropriate.']

Attached error: 
MongoDB Error Code 11000
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