Start the server with the attached database.
Run the following in the Mongo Console:
> db.properties.find({ '46' :
{ $gt : 10 }})
You should get one result.
> db.properties.ensureIndex(
{ '46' : 1})
true
> db.properties.find({ '46' :
})
You should get zero results.
> db.properties.dropIndex(
{ '46' : 1})
{"nIndexesWas" : 2 , "ok" : 1}> db.properties.find({ '46' :
{ $gt : 10 }})
You should get one result again.