SERVER-61656 Last point TS Opt M6: $topn(1) and/or $top

• 
• Closed

SERVER-61657 Last point TS Opt M3: Query rewrite for {meta: -1, ts: -1} case

• 
• Closed

SERVER-61658 Last point TS Opt M4: sort(ts)+group(meta.a)

• 
• Closed

SERVER-64019 Last point TS Opt M3: reverse DISTINCT_SCAN on $sort{meta: +-1, ts: 1}

• 
• Closed

SERVER-65005 Avoid $lookup in time-series last point optimization

• 
• Closed