Command option Sample:aws emr modify-instance-fleet

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Modifies the target On-Demand and target Spot capacities for theinstance fleet with the specified InstanceFleetID within the clusterspecified using ClusterID.Show details from next link. https://docs.aws.amazon.com/ja_jp/cli/latest/reference/emr/modify-instance-fleet.html

aws emr modify-instance-fleet --cluster-id 'j-12ABCDEFGHI34JK' --instance-fleet InstanceFleetId='if-2ABC4DEFGHIJ4'

modify-instance-groups — AWS CLI 1.16.6 Command Reference : http://docs.aws.amazon.com/cli/latest/reference/emr/modify-instance-fleet.html