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Now you might remember that earlier when we created an index, it seemed like there already was an index.

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Now we can always see all indexes that exist for a collection by using get indexes on the collection,

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so db contacts get indexes in our case here and this gives us some information about the indexes that

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we do have there.

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And as you can see, we got two indexes on contacts,

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the first one is actually one on the ID field and this is a default index mongodb maintains for

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you and then come your own indexes but you have this default index out of the box for every collection

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you create and therefore this is an index that will always be maintained by mongodb here automatically.

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And this means that if you are filtering for ID or sorting by ID which is then the default sort order

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or the order by which the documents are fetched, you utilize the index for that at least.