## Querying 

• SERVER-18364 5 Ensure non-negation predicates get chosen over negation predicates for multikey index bounds construction 

• SERVER-16265 6 Add query details to getmore entry in profiler and db.currentOp() 

• SERVER-15225 7 CachedPlanStage should execute for trial period and re-plan if query performs poorly 

• SERVER-13875 8 ensureIndex() of 2dsphere index breaks after upgrading to 2.6 (with the new createIndex command) 

## Replication 

• SERVER-18566 9 Primary member can trip fatal assertion if stepping down while running findAndModify op resulting in an upsert 

• SERVER-18511 10 Report upstream progress when initial sync completes 

• SERVER-18409 11 Retry failed heartbeats before marking a node as DOWN 

• SERVER-18326 12 Rollback attempted during initial sync is fatal 

• SERVER-17923 13 Creating/dropping multiple background indexes on the same collection can cause fatal error on secondaries 

• SERVER-17913 14 New primary should log voters at default log level 

• SERVER-17807 15 drain ops before restarting initial sync 

• SERVER-15252 16 Write unit tests of ScatterGatherRunner 

• SERVER-15192 17 Make all logOp listeners rollback-safe 

• SERVER-18190 18 Secondary reads block replication 

• SERVER-18566 19 Primary member can trip fatal assertion if stepping down while running findAndModify op resulting in an upsert 

## Sharding 

• SERVER-18822 20 Sharded clusters with WiredTiger primaries may lose writes during chunk migration 

• SERVER-18246 21 getmore on secondary in recovery mode can crash mongos 

