What method is used to delete indexes in MongoDB?

The method used to delete indexes in MongoDB is db.collection.dropIndex(). This method allows users to remove a specific index from a collection. It is essential to use the correct syntax when managing indexes because efficient querying often depends on having the proper indexes in place, and sometimes it might be necessary to remove indexes that are no longer needed or optimizing performance.

When using dropIndex, you can specify the index to be removed either by its name or the key specification used to create the index. Proper index management is critical for maintaining the performance of queries, so understanding how to effectively drop an index is an important skill for a MongoDB developer.

The options provided that mention removeIndex, deleteIndex, and clearIndex do not represent valid methods in MongoDB for dropping indexes, which further reinforces that dropIndex is the correct choice.