mongodb cant drop index after stopping indexing -

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i had run index on mongodb did

    db.devices.ensureindex({ "installed_packages" : 1 })

but when ran, noticed large , dont have time it, stopped indexing.

now, need run

    db.devices.reindex()

but tries again index on installed_packages

i dont need anymore, , when try run 

   db.devices.dropindex({ "installed_packages" : 1 })

it says :

{  "errmsg" : "can't find index key:{ installed_packages: 1.0 }", "ok" : 0 }

and if run:

    db.devices.dropindex("installed_packages_1")

it says:

    { "errmsg" : "index not found", "ok" : 0 }

what can drop it?


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