Hi,

It looks like convertToCapped doesn't recreate indexes on the collection. I'm not sure whether or not it's intended behavior but if it's not a bug it would be nice if the documentation could be updated to reflect the need to recreate indexes.

http://www.mongodb.org/display/DOCS/Capped+Collections#CappedCollections-Convertingacollectiontocapped

Thanks.

Steps to replicate:

U:Jeffs-MacBook-Air.local> db.foodle.save(

{ id:1, ts:new Date()}

)
U:Jeffs-MacBook-Air.local> db.foodle.ensureIndex(

{ ts:1 }

)
U:Jeffs-MacBook-Air.local> db.foodle.stats()
{
"ns" : "test.foodle",
"count" : 1,
"size" : 48,
"avgObjSize" : 48,
"storageSize" : 4096,
"numExtents" : 1,
"nindexes" : 2,
"lastExtentSize" : 4096,
"paddingFactor" : 1,
"flags" : 1,
"totalIndexSize" : 16352,
"indexSizes" :

{ "_id_" : 8176, "ts_1" : 8176 }

,
"ok" : 1
}
U:Jeffs-MacBook-Air.local> db.runCommand(

{ "convertToCapped":"foodle", size:100 }

)

{ "ok" : 1 }

U:Jeffs-MacBook-Air.local> db.foodle.stats()
{
"ns" : "test.foodle",
"count" : 1,
"size" : 48,
"avgObjSize" : 48,
"storageSize" : 4096,
"numExtents" : 1,
"nindexes" : 0,
"lastExtentSize" : 4096,
"paddingFactor" : 1,
"flags" : 0,
"totalIndexSize" : 0,
"indexSizes" : {

},
"capped" : 1,
"max" : 2147483647,
"ok" : 1
}