my cluster is three nodes with three nodes.now i add three nodes to cluster,
but data is not balance.old cluster is shard1,shard2,shard3.
new shard is shard4,shard5,shard6

Shard shard1 at shard1

{ data: '2321.65GiB', docs: 1093706109, chunks: 1, 'estimated data per chunk': '2321.65GiB', 'estimated docs per chunk': 1093706109 }

—
Shard shard6 at shard6

{ data: '1296.5GiB', docs: 610768855, chunks: 2950, 'estimated data per chunk': '450.04MiB', 'estimated docs per chunk': 207040 }

—
Shard shard2 at shard2

{ data: '2322.47GiB', docs: 1094092938, chunks: 1, 'estimated data per chunk': '2322.47GiB', 'estimated docs per chunk': 1094092938 }

—
Shard shard5 at shard5

{ data: '1296.59GiB', docs: 610814726, chunks: 3362, 'estimated data per chunk': '394.91MiB', 'estimated docs per chunk': 181681 }

—
Shard shard3 at shard3

{ data: '2317.19GiB', docs: 1091605741, chunks: 1, 'estimated data per chunk': '2317.19GiB', 'estimated docs per chunk': 1091605741 }

—
Shard shard4 at shard4

{ data: '1296.5GiB', docs: 610768841, chunks: 3334, 'estimated data per chunk': '398.2MiB', 'estimated docs per chunk': 183194 }

Totals

{ data: '10850.91GiB', docs: 5111757210, chunks: 9649, 'Shard shard1': [ '21.39 % data', '21.39 % docs in cluster', '2KiB avg obj size on shard' ], 'Shard shard6': [ '11.94 % data', '11.94 % docs in cluster', '2KiB avg obj size on shard' ], 'Shard shard2': [ '21.4 % data', '21.4 % docs in cluster', '2KiB avg obj size on shard' ], 'Shard shard5': [ '11.94 % data', '11.94 % docs in cluster', '2KiB avg obj size on shard' ], 'Shard shard3': [ '21.35 % data', '21.35 % docs in cluster', '2KiB avg obj size on shard' ], 'Shard shard4': [ '11.94 % data', '11.94 % docs in cluster', '2KiB avg obj size on shard' ] }