The collection has 5 indexes but indexesToBuild shows 0 unless the $currentop monitoring is run in building-index phase.    Atlas [mongos] testdb> db.getSiblingDB( "admin" ).aggregate([ { $currentOp: { allUsers: true , localOps: false } }, { $match: { type: "op" , "originatingCommand.reshardCollection" : "testdb.foo" } }] ) [ { shard: 'config' , totalCopyTimeElapsedSecs: Long ( '0' ), totalApplyTimeElapsedSecs: Long ( '0' ), totalCriticalSectionTimeElapsedSecs: Long ( '0' ), totalIndexBuildTimeElapsedSecs: Long ( '0' ), type: 'op' , desc: 'ReshardingMetricsDonorService ae27a28b-2a82-428a-8377-690e0ecbc29a' , op: 'command' , ns: 'testdb.foo' , originatingCommand: { reshardCollection: 'testdb.foo' , key: { sk1: 1 }, unique: ' false ' , collation: { locale: 'simple' } }, totalOperationTimeElapsedSecs: Long ( '52' ), donorState: 'donating-initial-data' , countWritesDuringCriticalSection: Long ( '0' ), countReadsDuringCriticalSection: Long ( '0' ), provenance: 'reshardCollection' }, { shard: 'config' , totalCopyTimeElapsedSecs: Long ( '52' ), totalApplyTimeElapsedSecs: Long ( '0' ), totalCriticalSectionTimeElapsedSecs: Long ( '0' ), totalIndexBuildTimeElapsedSecs: Long ( '0' ), isSameKeyResharding: false , type: 'op' , desc: 'ReshardingMetricsCoordinatorService ae27a28b-2a82-428a-8377-690e0ecbc29a' , op: 'command' , ns: 'testdb.foo' , originatingCommand: { reshardCollection: 'testdb.foo' , key: { sk1: 1 }, unique: ' false ' , collation: { locale: 'simple' } }, totalOperationTimeElapsedSecs: Long ( '52' ), coordinatorState: 'cloning' , provenance: 'reshardCollection' }, { shard: 'config' , totalCopyTimeElapsedSecs: Long ( '51' ), totalApplyTimeElapsedSecs: Long ( '0' ), totalCriticalSectionTimeElapsedSecs: Long ( '0' ), totalIndexBuildTimeElapsedSecs: Long ( '0' ), indexesToBuild: Long ( '0' ), indexesBuilt: Long ( '0' ), oplogEntriesFetched: Long ( '52' ), oplogEntriesApplied: Long ( '0' ), insertsApplied: Long ( '0' ), updatesApplied: Long ( '0' ), deletesApplied: Long ( '0' ), type: 'op' , desc: 'ReshardingMetricsRecipientService ae27a28b-2a82-428a-8377-690e0ecbc29a' , op: 'command' , ns: 'testdb.foo' , originatingCommand: { reshardCollection: 'testdb.foo' , key: { sk1: 1 }, unique: ' false ' , collation: { locale: 'simple' } }, totalOperationTimeElapsedSecs: Long ( '52' ), recipientState: 'cloning' , remainingOperationTimeEstimatedSecs: Long ( '51' ), approxDocumentsToCopy: Long ( '10000' ), approxBytesToCopy: Long ( '11568469' ), bytesCopied: Long ( '11568469' ), countWritesToStashCollections: Long ( '0' ), documentsCopied: Long ( '10000' ), provenance: 'reshardCollection' } ]   Atlas [mongos] testdb> db.foo.getIndexes() [ { v: 2, key: { _id: 1 }, name: '_id_' }, { v: 2, key: { _id: 'hashed' }, name: '_id_hashed' }, { v: 2, key: { index1: 1 }, name: 'index1_1' }, { v: 2, key: { index2: 1 }, name: 'index2_1' }, { v: 2, key: { index3: 1 }, name: 'index3_1' } ]