[SERVER-21681] In-memory storage engine not reporting index size - MongoDB Jira

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Backwards Compatibility:
Fully Compatible
Backport Completed:

3.2.5
Steps To Reproduce:

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Start an in-Memory instance (I have verified the problem with both standalone and RS).
Load some data in any collection.
db.stats() and db.c.stats() shows index size to be 4096 independently of the collection size. If several index are created, each one is 4096 bytes size.

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Start an in-Memory instance (I have verified the problem with both standalone and RS). Load some data in any collection. db.stats() and db.c.stats() shows index size to be 4096 independently of the collection size. If several index are created, each one is 4096 bytes size.
Sprint:
Integration F (02/01/16), Integration 10 (02/22/16), Integration 11 (03/14/16)
Linked BF Score:
0

Playing with 3.2.0-rc4 I have found that the db.stats() command is always informing the size of indexes as 4096 bytes.

MongoDB Enterprise inMem:PRIMARY> db.stats()

	"db" : "POCDB",

	"collections" : 1,

	"objects" : 1876714,

	"avgObjSize" : 285.37579247557164,

	"dataSize" : 535568745,

	"storageSize" : 535568745,

	"numExtents" : 0,

	"indexes" : 1,

	"indexSize" : 4096,

	"ok" : 1

This is also affecting compass index size report.