Counting runs count takes too much MongoDB CPU #2199
Description
Describe the bug
When application is counting Runs count for the landing page info, it consumer too much CPU.
To Reproduce
See server logs
Expected behavior
It might not be necessary to run full scan of the table.
Log
2023-10-27T06:31:47.590+0000 I COMMAND [conn7104853] command menas_galactic.run_v1 command: aggregate { aggregate: "run_v1", pipeline: [ { $match: {} }, { $group: { _id: 1, n: { $sum: 1 } } } ], cursor: {}, $db: "menas_galactic", $clusterTime: { clusterTime: Timestamp(1698388263, 159), signature: { hash: BinData(0, E86133DC3872EAE27881D51B179B0E150F1E874A), keyId: 7256402329547571201 } }, lsid: { id: UUID("5a5b1fa6-3fc7-4f36-9a38-e9ae6c73e7cd") } } planSummary: COLLSCAN keysExamined:0 docsExamined:6077042 cursorExhausted:1 numYields:47554 nreturned:1 reslen:259 locks:{ Global: { acquireCount: { r: 47556 } }, Database: { acquireCount: { r: 47556 } }, Collection: { acquireCount: { r: 47556 } } } storage:{ data: { bytesRead: 15558954293, timeReadingMicros: 17675795 }, timeWaitingMicros: { cache: 2796143 } } protocol:op_msg 42437ms