Resolve unassigned shards?

ip           heap.percent ram.percent cpu load_1m load_5m load_15m node.role master name
10.46.88.125           28         100  16    8.16    9.12     8.39 himrst    *      instance-0000000012
10.46.88.30            61          86  19   13.27    9.39     8.33 cr        -      instance-0000000009
10.46.88.23            40          95   3    0.65    0.95     1.17 rw        -      instance-0000000007
10.46.88.61            63          94   2    0.81    0.66     0.68 f         -      instance-0000000010
10.46.88.37            60          90   2    1.98    2.17     2.10 lr        -      instance-0000000013