Missing stats on Index ( total-index-items, avg item size, scan/requests)

0. create bucket default, create index on default(name) where name="mary"
cbq> select * from system:indexes;
{
"requestID": "561a54ce-16f5-47ba-ad8d-3bd47af9227c",
"signature":

{ "*": "*" }

,
"results": [
{
"indexes":

{ "condition": "(`name` = \"mary\")", "datastore_id": "http://127.0.0.1:8091", "id": "828a4aee976b196e", "index_key": [ "`name`" ], "keyspace_id": "default", "name": "name", "namespace_id": "default", "state": "online", "using": "gsi" }

}
],
"status": "success",
"metrics":

{ "elapsedTime": "231.369511ms", "executionTime": "230.724424ms", "resultCount": 2, "resultSize": 833 }

}
1. load 1M items on a bucket default, note indexes are in "ready state"
2. NOticed that there are a number of stats on the index-stats which are never updated.

eg:
total items
avg item size
scans/sec ( not sure if this is relevant, since there are no queries addressed to the index at this point)

The only stats getting updated are "items remaining", disk-size, data-size and drain rate.

attached is a screenshot, attaching logs.

I would expect the above numbers to be reflected on the stats, especially when the index is in a "Built" and ready status.