What is the method for retaining the final record of the day in MongoDb Time series while deleting all the others?

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The method for retaining the final record of the day in MongoDb Time series while deleting all the others involves a combination of the following steps:

1. Use the Aggregation framework to group records by day and find the latest record for each day using the $last operator.

2. Store the latest records in a new collection.

3. Drop the original collection to delete all records.

4. Copy the latest records back into the original collection.

This method ensures that only the latest record for each day is retained while all others are deleted.